Observation of squeezed states with strong photon number oscillations (2009)
Mehmet, Moritz, Vahlbruch, Henning, Lastzka, Nico, Danzmann, Karsten, Schnabel, Roman
Squeezed states of light constitute an important nonclassical resource in the field of high-precision measurements, e.g. gravitational wave detection, as well as in the field of quantum information,...
Quantum state preparation and macroscopic entanglement in gravitational-wave detectors (2009)
Mueller-Ebhardt, Helge, Rehbein, Henning, Li, Chao, Mino, Yasushi, Somiya, Kentaro, Schnabel, Roman, ...
Long-baseline laser-interferometer gravitational-wave detectors are operating at a factor of 10 (in amplitude) above the standard quantum limit (SQL) within a broad frequency band. Such a low...
Observation of continuous-wave squeezed light at 1550 nm (2009)
Mehmet, Moritz, Steinlechner, Sebastian, Eberle, Tobias, Vahlbruch, Henning, Thüring, André, Danzmann, Karsten, ...
We report on the generation of continuous-wave squeezed vacuum states of light at the telecommunication wavelength of 1550 nm. The squeezed vacuum states were produced by type I optical parametric...
The Einstein@Home search for periodic gravitational waves in LIGO S4 data (2009)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
A search for periodic gravitational waves, from sources such as isolated rapidly-spinning neutron stars, was carried out using 510 hours of data from the fourth LIGO science run (S4). The search was...
Demonstration of a cavity coupler based on a resonant waveguide grating (2009)
Brueckner, Frank, Friedrich, Daniel, Clausnitzer, Tina, Burmeister, Oliver, Britzger, Michael, Kley, Ernst-Bernhard, ...
Thermal noise in multilayer optical coatings may not only limit the sensitivity of future gravitational wave detectors in their most sensitive frequency band but is also a major impediment for...
DC-readout of a signal-recycled gravitational wave detector (2009)
Hild, S., Grote, Hartmut, Degallaix, Jerome, Chelkowski, S., Danzmann, Karsten, Freise, A., ...
All first-generation large-scale gravitational wave detectors are operated at the dark fringe and use a heterodyne readout employing radio frequency (RF) modulation-demodulation techniques. However,...
Broadband squeezing of quantum noise in a Michelson interferometer with Twin-Signal-Recycling (2009)
Thüring, Andre, Gräf, Christian, Vahlbruch, Henning, Mehmet, Moritz, Danzmann, Karsten, Schnabel, Roman
Twin-Signal-Recycling (TSR) builds on the resonance doublet of two optically coupled cavities and efficiently enhances the sensitivity of an interferometer at a dedicated signal frequency. We report...
Quantum state preparation and macroscopic entanglement in gravitational-wave detectors (2009)
Müller-Ebhardt, Helge, Rehbein, Henning, Li, Chao, Mino, Yasushi, Somiya, Kentaro, Schnabel, Roman, ...
Long-baseline laser-interferometer gravitational-wave detectors are operating at a factor of 10 (in amplitude) above the standard quantum limit (SQL) within a broad frequency band. Such a low...
Observation of cw squeezed light at 1550 nm (2009)
Mehmet, Moritz, Steinlechner, Sebastian, Eberle, Tobias, Vahlbruch, Henning, Thüring, Andre, Danzmann, Karsten, ...
We report on the generation of continuous-wave squeezed vacuum states of light at the telecommunication wavelength of 1550 nm. The squeezed vacuum states were produced by type I optical parametric...
EOM sideband phase characteristics for the spaceborne gravitational wave detector LISA (2009)
Barke, Simon, Tröbs, Michael, Sheard, Benjamin, Heinzel, Gerhard, Danzmann, Karsten
The Laser Interferometer Space Antenna (LISA) is a joint ESA/NASA mission proposed to observe gravitational waves. One important noise source in the LISA phase measurement will be on-board reference...
Analog phase lock between two lasers at LISA power levels (2009)
Diekmann, Christian, Steier, Frank, Sheard, Benjamin, Heinzel, Gerhard, Danzmann, Karsten
This paper presents the implementation of an analog optical phase-locked-loop with an offset frequency of about 20 MHz between two lasers, where the detected light powers were of the order of 31 pW...
Free-space laser ranging and data communication (2009)
Delgado, J. J. E., Marin, A. F. G., Bykov, I., Heinzel, Gerhard, Danzmann, Karsten
Ranging measurements in the radio band have been extensively used in space-based applications, for example in GNSS for navigation and GRACE for mapping the Earth's gravity field. However, the...
Trobs, Michael, D'Arcio, Luigi, Heinzel, Gerhard, Danzmann, Karsten
We have investigated an ytterbium-doped distributed-feedback fiber master oscillator power amplifier system emitting 1 W and its suitability for the space-borne interferometric gravitational-wave...
Laser interferometer for spaceborne mapping of the Earth's gravity field (2009)
Dehne, Marina, Cervantes, Felipe Guzman, Sheard, Benjamin, Heinzel, Gerhard, Danzmann, Karsten
The Gravity Recovery and Climate Experiment (GRACE) is one of the present missions to map the Earth's gravity field. The aim of a GRACE follow-on mission is to map the gravitational field of the...
LISA phasemeter development: advanced prototyping (2009)
Bykov, Iouri, Delgado, Juan Jose Esteban, Marin, Antonio Francisco Garcia, Heinzel, Gerhard, Danzmann, Karsten
We present the status of our investigations on the LISA Phasemeter. The new prototype is based on a custom-designed breadboard with four high-speed ADC and two DAC channels, extended readout...
Fleddermann, Roland, Steier, Frank, Tröbs, Michael, Bogenstahl, Johanna, Killow, Christian, Heinzel, Gerhard, ...
Polarization maintaining single-mode optical fibers are key components in the interferometry of the Laser Interferometer Space Antenna (LISA). LISA's measurement principle relies on the availability...
Phase noise contribution of EOMs and HF cables (2009)
Barke, Simon, Tröbs, Michael, Sheard, Benjamin, Heinzel, Gerhard, Danzmann, Karsten
Two key components of LISA's inter-spacecraft clock tone transfer chain are electro-optic modulators (EOMs) and high-frequency (HF) cable assemblies. At modulation frequencies of 2 GHz, we...
Shot-noise-limited laser power stabilization with a high-power photodiode array (2009)
Kwee, Patrick, Willke, Benno, Danzmann, Karsten
The output power of a cw Nd:YAG laser was stabilized in a dc-coupled feedback loop with a low-noise multiphotodiode detector and an electro-optic amplitude modulator in the frequency band from 1 Hz...
The Einstein@Home search for periodic gravitational waves in early S5 LIGO data (2009)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
This paper reports on an all-sky search for periodic gravitational waves from sources such as deformed isolated rapidly spinning neutron stars. The analysis uses 840 hours of data from 66 days of the...
Strong reduction of laser power noise by means of a Kerr nonlinear cavity (2009)
Khalaidovski, Alexander, Thüring, André, Rehbein, Henning, Lastzka, Nico, Willke, Benno, Danzmann, Karsten, ...
We demonstrated the power noise reduction of a continuous-wave laser field by means of an effective third-order Kerr nonlinear cavity. In contrast to conventional noise reduction schemes relying on...
Double optical spring enhancement for gravitational-wave detectors (2008)
Rehbein, Henning, Müller-Ebhardt, Helge, Somiya, Kentaro, Danilishin, Stefan L., Schnabel, Roman, Danzmann, Karsten, ...
Currently planned second-generation gravitational-wave laser interferometers such as Advanced LIGO exploit the extensively investigated signal-recycling technique. Candidate Advanced LIGO...
Creation of a quantum oscillator by classical control (2008)
Danilishin, Stefan, Müller-Ebhardt, Helge, Rehbein, Henning, Somiya, Kentaro, Schnabel, Roman, Danzmann, Karsten, ...
As a pure quantum state is being approached via linear feedback, and the occupation number approaches and eventually goes below unity, optimal control becomes crucial. We obtain theoretically the...
Double optical spring enhancement for gravitational wave detectors (2008)
Rehbein, Henning, Mueller-Ebhardt, Helge, Somiya, Kentaro, Danilishin, Stefan L., Schnabel, Roman, Danzmann, Karsten, ...
Currently planned second-generation gravitational-wave laser interferometers such as Advanced LIGO exploit the extensively investigated signal-recycling (SR) technique. Candidate Advanced LIGO...
Müller-Ebhardt, Helge, Rehbein, Henning, Schnabel, Roman, Danzmann, Karsten, Chen, Yanbei
We show that the generation of entanglement of two heavily macroscopic mirrors with masses of up to several kilograms are feasible with state of the art techniques of high-precision laser...
Observation of squeezed light with 10dB quantum noise reduction (2008)
Vahlbruch, Henning, Mehmet, Moritz, Lastzka, Nico, Hage, Boris, Chelkowski, Simon, Franzen, Alexander, ...
Squeezing of light's quantum noise requires temporal rearranging of photons. This again corresponds to creation of quantum correlations between individual photons. Squeezed light is a non-classical...
Giant Kerr effect in closed degenerate two-level transitions (2008)
Spani Molella, Luca, Rinkleff, Rolf-Hermann, Kühn, Gerrit, Danzmann, Karsten
Extremely large optical Kerr non-linearities (n2) and (n4) were measured in two closed degenerate two-level transitions in the caesium D2 line when a probe and a coupling laser simultaneously probed...
Subtraction of test mass angular noise in the LISA technology package interferometer (2008)
Guzman Cervantes, Felipe, Steier, Frank, Wanner, Gudrun, Heinzel, Gerhard, Danzmann, Karsten
When the position of a test mass in one dimension is measured with picometer accuracy, angular alignment jitter inevitably couples noise into the measurement. We present recent sensitivity...
Diffractive beam splitter characterization via a power-recycled interferometer (2008)
Friedrich, Daniel, Burmeister, Oliver, Bunkowski, Alexander, Clausnitzer, Tina, Fahr, Stephan, Kley, Ernst-Bernhard, ...
We used the high-precision laser interferometer technique of power recycling to characterize the optical loss of an all-reflective grating beam splitter. This beam splitter was used to set up a...
Dahl, Katrin, Spani Molella, Luca, Rinkleff, Rolf-Hermann, Danzmann, Karsten
The absorption of a resonant coupling laser driving a closed degenerate two-level system in an atomic cesium beam was investigated as a function of the detuning of a second laser probing the same...
McNamara, P. W., Vitale, S., Danzmann, Karsten
LISA Pathfinder (formerly known as SMART-2) is an ESA mission designed to pave the way for the joint ESA/NASA Laser Interferometer Space Antenna (LISA) mission by testing in-flight the critical...
Stabilized lasers for advanced gravitational wave detectors (2008)
Willke, Benno, Danzmann, Karsten, Frede, Maik, King, Peter, Kracht, D., Kwee, Patrick, ...
Second generation gravitational wave detectors require high power lasers with more than 100 W of output power and with very low temporal and spatial fluctuations. To achieve the demanding stability...
Optical ac coupling to overcome limitations in the detection of optical power fluctuations (2008)
Kwee, Patrick, Willke, Benno, Danzmann, Karsten
A high-sensitivity detection method for optical power fluctuations is demonstrated based on photodetection in reflection of an optical resonator with a specific impedance matching. That resonator is...
Implications for the origin of GRB 070201 from LIGO observations (2008)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We analyzed the available LIGO data coincident with GRB 070201, a short-duration, hard-spectrum gamma-ray burst (GRB) whose electromagnetically determined sky position is coincident with the spiral...
Astrophysically triggered searches for gravitational waves: status and prospects (2008)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
In gravitational-wave detection, special emphasis is put onto searches that focus on cosmic events detected by other types of astrophysical observatories. The astrophysical triggers, e. g. from...
A joint search for gravitational wave bursts with AURIGA and LIGO (2008)
Baggio, L., Bignotto, M., Bonaldi, M., Cerdonio, M., De Rosa, M., Falferi, P., ...
The first simultaneous operation of the AURIGA detector(63) and the LIGO observatory(64) was an opportunity to explore real data, joint analysis methods between two very different types of...
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We present the results of a search for short-duration gravitational-wave bursts associated with 39 gamma-ray bursts (GRBs) detected by gamma-ray satellite experiments during LIGO's S2, S3, and S4...
Search for gravitational waves from binary inspirals in S3 and S4 LIGO data (2008)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We report on a search for gravitational waves from the coalescence of compact binaries during the third and fourth LIGO science runs. The search focused on gravitational waves generated during the...
Monolithic dielectric surfaces as new low-loss light-matter interfaces (2008)
Brückner, Frank, Clausnitzer, Tina, Burmeister, Oliver, Friedrich, Daniel, Kley, Ernst-Bernhard, Danzmann, Karsten, ...
We propose a new mirror architecture, which is solely based upon structuring of the surface of a monolithic, possibly monocrystalline, bulk material. We found that a structure of T-shaped ridges of a...
All-sky search for periodic gravitational waves in LIGO S4 data (2008)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We report on an all-sky search with the LIGO detectors for periodic gravitational waves in the frequency range 50-1000 Hz and with the frequency's time derivative in the range -1 x 10(-8) Hz s(-1) to...
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We report on the methods and results of the first dedicated search for gravitational waves emitted during the inspiral of compact binaries with spinning component bodies. We analyze 788 hours of data...
Opto-mechanical frequency shifting of scattered light (2008)
Lück, Harald, Degallaix, Jerome, Grote, Hartmut, Hewitson, Martin, Hild, Stefan, Willke, Benno, ...
Light being scattered back from external surfaces or optical components can affect the sensitivity of optical measurement systems such as interferometers. By modulating the optical path length in...
Power-recycled michelson interferometer with a 50/50 grating beam splitter (2008)
Friedrich, Daniel, Burmeister, Oliver, Britzger, M., Bunkowski, Alexander, Clausnitzer, Tina, Fahr, Stephan, ...
We designed and fabricated an all-reflective 50/50 beam splitter based on a dielectric grating. This beam splitter was used to set up a power-recycled Michelson interferometer with a finesse of about...
Double optical spring enhancement for gravitational wave detectors (2008)
Rehbein, Henning, Müller-Ebhardt, Helge, Somiya, Kentaro, Danilishin, Stefan L., Schnabel, Roman, Danzmann, Karsten, ...
Currently planned second-generation gravitational-wave laser interferometers such as Advanced LIGO exploit the extensively investigated signal-recycling technique. Candidate Advanced LIGO...
Beating the spin-down limit on gravitational wave emission from the Crab pulsar (2008)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
We present direct upper limits on gravitational wave emission from the Crab pulsar using data from the first 9 months of the fifth science run of the Laser Interferometer Gravitational-wave...
Switch of Absorption in Coherently Driven Media (2008)
Dahl, Katrin, Spani Molella, Luca, Rinkleff, Rolf-Hermann, Danzmann, Karsten
Search for Gravitational-Wave Bursts from Soft Gamma Repeaters (2008)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
We present a LIGO search for short-duration gravitational waves (GWs) associated with soft gamma ray repeater (SGR) bursts. This is the first search sensitive to neutron star f modes, usually...
First joint search for gravitational-wave bursts in LIGO and GEO 600 data (2008)
Abbott, B., Abbott, R., Adhikari, R., Ajith, P., Allen, Bruce, Allen, Gabrielle, ...
We present the results of the first joint search for gravitational-wave bursts by the LIGO and GEO 600 detectors. We search for bursts with characteristic central frequencies in the band 768-2048 Hz...
Rinkleff, Rolf-Hermann, Spani Molella, Luca, Rocco, Alessandro, Wicht, Andreas, Danzmann, Karsten
Negative dispersion and transparency in a strongly driven calcium two-level system and positive dispersion and transparency or anomalous dispersion and enhanced absorption in closed degenerate...
Switching of Absorption in Coherently Driven Media (2008)
Dahl, Katrin, Spani Molella, Luca, Rinkleff, Rolf-Hermann, Danzmann, Karsten
A system usually characterized by electromagnetically induced absorption was investigated with a probe and a coupling laser. Properly tuning the laser polarizations and intensities, first...
Dahl, Katrin, Spani Molella, Luca, Rinkleff, Rolf-Hermann, Danzmann, Karsten
Using probe and coupling lasers, a system characterized by electromagnetically induced absorption was investigated. A switch of the EIA peak of the coupling laser to a dip was measured as function of...
Creation of a quantum oscillator by classical control (2008)
Danilishin, Stefan, Müller-Ebhardt, Helge, Rehbein, Henning, Somiya, Kentaro, Schnabel, Roman, Danzmann, Karsten, ...
As a pure quantum state is being approached via linear feedback, and the occupation number approaches and eventually goes below unity, optimal control becomes crucial. We obtain theoretically the...
Rinkleff, Rolf-Hermann, Molella, Lucca Spani, Rocco, Alessandra, Wicht, Andreas, Danzmann, Karsten
Negative dispersion and transparency in strongly driven two-level system in calcium and positive dispersion and transparency or anomalous dispersion and enhanced absorption in closed degenerate...
Schroeter, Anja, Nawrodt, Ronny, Schnabel, Roman, Reid, Stuart, Martin, Iain, Rowan, Sheila, ...
Current interferometric gravitational wave detectors (IGWDs) are operated at room temperature with test masses made from fused silica. Fused silica shows very low absorption at the laser wavelength...
Local readout enhancement for detuned signal-recycling interferometers (2007)
Rehbein, Henning, Müller-Ebhardt, Helge, Somiya, Kentaro, Li, Chao, Schnabel, Roman, Danzmann, Karsten, ...
High power detuned signal-recycling interferometers currently planned for second-generation interferometric gravitational-wave detectors (for example Advanced LIGO) are characterized by two...
Quantum engineering of squeezed states for quantum communication and metrology (2007)
Vahlbruch, Henning, Chelkowski, Simon, Danzmann, Karsten, Schnabel, Roman
We report the experimental realization of squeezed quantum states of light, tailored for new applications in quantum communication and metrology. Squeezed states in a broad Fourier frequency band...
Detuned Twin-Signal-Recycling for ultra-high precision interferometers (2007)
Thuering, Andre, Schnabel, Roman, Lueck, Harald, Danzmann, Karsten
We propose a new interferometer technique for high precision phase measurements such as those in gravitational wave detection. The technique utilizes a pair of optically coupled resonators that...
Coherent control of vacuum squeezing in the Gravitational-Wave Detection Band (2007)
Vahlbruch, Henning, Chelkowski, Simon, Hage, Boris, Franzen, Alexander, Danzmann, Karsten, Schnabel, Roman
We propose and demonstrate a coherent control scheme for stable phase locking of squeezed vacuum fields. We focus on sideband fields at frequencies from 10Hz to 10kHz which is a frequency regime of...
Vahlbruch, Henning, Chelkowski, Simon, Hage, Boris, Franzen, Alexander, Danzmann, Karsten, Schnabel, Roman
We report on the experimental combination of three advanced interferometer techniques for gravitational wave detection, namely power-recycling, detuned signal-recycling and squeezed field injection....
Squeezed-field injection for gravitational wave interferometers (2007)
Vahlbruch, Henning, Chelkowski, Simon, Hage, Boris, Franzen, Alexander, Danzmann, Karsten, Schnabel, Roman
In a recent table-top experiment we demonstrated the compatibility of three advanced interferometer techniques for gravitational wave detection, namely power-recycling, detuned signal-recycling and...
Analysis of a four-mirror cavity enhanced Michelson interferometer (2007)
Thuering, Andre, Lueck, Harald, Danzmann, Karsten
We investigate the shot noise limited sensitivity of a four-mirror cavity enhanced Michelson interferometer. The intention of this interferometer topology is the reduction of thermal lensing and the...
Experimental characterization of frequency dependent squeezed light (2007)
Chelkowski, Simon, Vahlbruch, Henning, Hage, Boris, Franzen, Alexander, Lastzka, Nico, Danzmann, Karsten, ...
We report on the demonstration of broadband squeezed laser beams that show a frequency dependent orientation of the squeezing ellipse. Carrier frequency as well as quadrature angle were stably locked...
Observation of squeezed light with 10dB quantum noise reduction (2007)
Vahlbruch, Henning, Mehmet, Moritz, Lastzka, Nico, Hage, Boris, Chelkowski, Simon, Franzen, Alexander, ...
Squeezing of light's quantum noise requires temporal rearranging of photons. This again corresponds to creation of quantum correlations between individual photons. Squeezed light is a non-classical...
Local readout enhancement for detuned signal-recycling interferometers (2007)
Rehbein, Henning, Mueller-Ebhardt, Helge, Somiya, Kentaro, Li, Chao, Schnabel, Roman, Danzmann, Karsten, ...
Motivated by the optical-bar scheme of Braginsky, Gorodetsky and Khalili, we propose to add to a high power detuned signal-recycling interferometer a local readout scheme which measures the motion of...
Coherent control of broadband vacuum squeezing (2007)
Chelkowski, Simon, Vahlbruch, Henning, Danzmann, Karsten, Schnabel, Roman
We present the observation of optical fields carrying squeezed vacuum states at sideband frequencies from 10Hz to above 35MHz. The field was generated with type-I optical parametric oscillation below...
Mueller-Ebhardt, Helge, Rehbein, Henning, Schnabel, Roman, Danzmann, Karsten, Chen, Yanbei
We show that the generation of entanglement of two heavily macroscopic mirrors with masses of up to several kilograms are feasible with state of the art techniques of high-precision laser...
Detuned Twin-Signal-Recycling for ultrahigh-precision interferometers (2007)
Thüring, Andre, Schnabel, Roman, Lück, Harald, Danzmann, Karsten
We propose a new interferometer technique for high-precision phase measurements such as those in gravitational wave detection. The technique utilizes a pair of optically coupled resonators that...
Real-time phasefront detector for heterodyne interferometers (2007)
Guzman Cervantes, Felipe, Heinzel, Gerhard, Garcia Marin, Antonio Francisco, Wand, V., Steier, Frank, Jennrich, Oliver, ...
We present a real-time differential phase-front detector sensitive to better than 3 mrad rms, which corresponds to a precision of approximately 500 pm. This detector performs a spatially resolving...
Spani Molella, Luca, Rinkleff, Rolf-Hermann, Kühn, Gerrit, Danzmann, Karsten
Spontaneous transfer of coherence has proven to be a good interpretative scheme for the explantation of the spectra of a probe laser probing a closed degenerate two-level systems. With its aid it was...
Coherent control of broadband vacuum squeezing (2007)
Chelkowski, Simon, Vahlbruch, Henning, Danzmann, Karsten, Schnabel, Roman
We present the observation of optical fields carrying squeezed vacuum states at sideband frequencies from 10 Hz to above 35 MHz. The field was generated with type-I optical parametric oscillation...
Hild, Stefan, Grote, Hartmut, Hewitson, Martin, Lück, Harald, Smith, J. R., Strain, Ken A., ...
The British/German gravitational wave detector GEO 600 located near Hannover in Germany is the first large-scale gravitational-wave detector using the advanced technique of signal recycling....
Interferometry for LISA and LISA Pathfinder (2007)
Garcia Marin, Antonio Francisco, Heinzel, Gerhard, Danzmann, Karsten
The Laser Interferometer Space Antenna (LISA) is a joint ESA-NASA mission designed to observe gravitational waves in the frequency range between 10−4 to 1 Hz, where ground-based detectors are...
Local readout enhancement for detuned signal-recycling interferometers (2007)
Müller-Ebhardt, Helge, Rehbein, Henning, Schnabel, Roman, Danzmann, Karsten, Chen, Yanbei, Li, Chao, ...
Motivated by the optical-bar scheme of Braginsky, Gorodetsky and Khalili, we propose to add to a high power detuned signal-recycling interferometer a local readout scheme which measures the motion of...
Mechanical Q-factor measurements on a test mass with a structured surface (2007)
Nawrodt, Ronny, Zimmer, A., Koettig, Torsten, Clausnitzer, Tina, Bunkowski, Alexander, Kley, Ernst-Bernhard, ...
We present mechanical Q-factors (quality factors) of a crystalline quartz test mass with a nano-structured surface, measured in the temperature regime from 5 to 300 K. The nano-structure was a...
Quantum engineering of squeezed states for quantum communication and metrology (2007)
Vahlbruch, Henning, Chelkowski, Simon, Danzmann, Karsten, Schnabel, Roman
We report the experimental realization of squeezed quantum states of light, tailored for new applications in quantum communication and metrology. Squeezed states in a broad Fourier frequency band...
Laser beam quality and pointing measurement with an optical resonator (2007)
Kwee, Patrick, Seifert, Frank, Willke, Benno, Danzmann, Karsten
We present a compact diagnostic breadboard that is based on an optical ring resonator for measuring beam quality and pointing of single-frequency continuous wave lasers at a wavelength of 1064 nm. To...
Abbott, B., Abbott, R., Adhikari, R., Boschi, V., Agresti, Juri, Ajith, P., ...
We report on a search for gravitational waves from binary black hole inspirals in the data from the second science run of the LIGO interferometers. The search focused on binary systems with component...
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
Data from the LIGO Livingston interferometer and the ALLEGRO resonant bar detector, taken during LIGO's fourth science run, were examined for cross-correlations indicative of a stochastic...
Upper limit map of a background of gravitational waves (2007)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We searched for an anisotropic background of gravitational waves using data from the LIGO S4 science run and a method that is optimized for point sources. This is appropriate if, for example, the...
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
We carry out two searches for periodic gravitational waves using the most sensitive few hours of data from the second LIGO science run. Both searches exploit fully coherent matched filtering and...
Upper limits on gravitational wave emission from 78 radio pulsars (2007)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
Search for gravitational-wave bursts in LIGO data from the fourth science run (2007)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
The fourth science run of the LIGO and GEO 600 gravitational-wave detectors, carried out in early 2005, collected data with significantly lower noise than previous science runs. We report on a search...
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
The Laser Interferometer Gravitational‐Wave Observatory (LIGO) has performed the fourth science run, S4, with significantly improved interferometer sensitivities with respect to previous runs....
Hewitson, Martin, Danzmann, Karsten, Grote, Hartmut, Hild, Stefan, Hough, J., Lück, Harald, ...
Spurious charging of the test masses in gravitational wave interferometers is a well-known problem. Typically, concern arises due to the possibility of increased thermal noise due to a lowering of...
Photon-pressure-induced test mass deformation in gravitational-wave detectors (2007)
Hild, Stefan, Brinkmann, Marc, Danzmann, Karsten, Grote, Hartmut, Hewitson, Martin, Hough, J., ...
A widely used assumption within the gravitational-wave community has so far been that a test mass acts like a rigid body for frequencies in the detection band, i.e. for frequencies far below the...
Thermal diagnostic of the optical window on board LISA Pathfinder (2007)
Nofrarias, Miquel, Garcia Marin, A. F., Lobo, Alberto, Heinzel, Gerhard, Ramos-Castro, J., Sanjuan, J., ...
Vacuum conditions inside the LTP Gravitational Reference Sensor must comply with rather demanding requirements. The Optical Window (OW) is an interface which seals the vacuum enclosure and, at the...
The GEO 600 core optics (2007)
Winkler, Walter, Danzmann, Karsten, Grote, Hartmut, Hewitson, Martin, Hild, Stefan, Hough, J., ...
The optical layout of the interferometric gravitational wave detector GEO600 is described in detail. Criteria for the choice of the geometry of this power- and signal recycled interferometer are...
Spani Molella, Luca, Rinkleff, Rolf-Hermann, Danzmann, Karsten
The concept of parametric spectra in electromagnetically induced transparency is clarified. In this context, the possibility for a coupling laser to reach absorption levels below the one-photon...
Schroeter, Anja, Nawrodt, Ronny, Schnabel, Roman, Reid, Stuart, Martin, Ian, Rowan, Sheila, ...
Current interferometric gravitational wave detectors (IGWDs) are operated at room temperature with test masses made from fused silica. Fused silica shows very low absorption at the laser wavelength...
Phase locking to a LISA arm: first results on a hardware model (2006)
Marin, Antonio F Garcia, Heinzel, Gerhard, Schilling, Roland, Ruediger, Albrecht, Wand, Vinzenz, Steier, Frank, ...
We present the first experimental confirmation of the so-called "self-phaselocked delay interferometry". This laser frequency stabilization technique consists basically in comparing the prompt laser...
Status of GEO600 detector (2006)
Willke,Benno, Aufmuth,Peter, Aulbert,Carsten, Babak,S., Balasubramanian,R., Barr,B., ...
Of all the large interferometric gravitational-wave detectors, the German/British project GEO600 is the only one which uses dual recycling. During the four weeks of the international S4 data-taking...
Willke,Benno, Aufmuth,Peter, Aulbert,Carsten, Babak,S., Balasubramanian,R., Barr,B., ...
The GEO 600 gravitational wave detector uses advanced technologies including signal recycling and monolithic fused-silica suspensions to achieve a sensitivity close to the kilometre scale LIGO and...
Squeezed-field injection for gravitational wave interferometers (2006)
Vahlbruch,Henning, Chelkowski,Simon, Hage,Boris, Franzen,Alexander, Schnabel,Roman, Danzmann,Karsten
In a recent table-top experiment, we demonstrated the compatibility of three advanced interferometer techniques for gravitational wave detection, namely power-recycling, detuned signal recycling and...
Spectral measurement of the Cs D2 line with a tunable heterodyne interferometer (2006)
Spani Molella, Luca, Rinkleff, Rolf-Hermann, Danzmann, Karsten
The optical properties of a caesium atomic beam driven on a resonant hyperfine transition in the D2 line were studied as a function of the probe laser frequency. Using a third off-resonant laser...
Three-port beam splitters–combiners for interferometer applications (2006)
Schnabel, Roman, Bunkowski, Alexander, Burmeister, Oliver, Danzmann, Karsten
We derive generic phase and amplitude coupling relations for beam splitters-combiners that couple a single port with three output ports or input ports, respectively. We apply the coupling relations...
Linear projection of technical noise for interferometric gravitational-wave detectors (2006)
Smith, J. R., Ajith, J. R., Grote, Hartmut, Hewitson, Martin, Hild, Stefan, Lück, Harald, ...
An international network of interferometric gravitational-wave detectors is now in operation, and has entered a period of intense commissioning focused on bringing the instruments to their...
Laser development for LISA (2006)
Tröbs, Michael, Weßels, P., Fallnich, Carsten, Bode, M., Freitag, Ingo, Skorupka, Sascha, ...
The two most promising configurations for the LISA laser are a stand-alone diode-pumped nonplanar ring oscillator (NPRO) or a fibre amplifier seeded by a low-power NPRO. The stand-alone laser was...
Noise sources in the LTP heterodyne interferometer (2006)
Wand, V., Bogenstahl, Johanna, Braxmaier, Claus, Danzmann, Karsten, Garcia, Antonio C., Guzman, F., ...
The LISA Technology Package uses a heterodyne Mach–Zehnder interferometer to monitor the relative motion of the test masses with picometer accuracy. This paper discusses two classes of noise...
LISA interferometry: recent developments (2006)
Heinzel, Gerhard, Braxmaier, Claus, Danzmann, Karsten, Gath, P., Hough, J., Jennrich, Oliver, ...
LISA, the Laser Interferometer Space Antenna, will be launched by NASA and ESA in the 2014 timeframe and will be the first gravitational wave observatory for the many fascinating sources at low...
On-orbit alignment and diagnostics for the LISA Technology Package (2006)
Garcia Marin, Antonio Francisco, Wand, V., Steier, Frank, Guzman Cervantes, Felipe, Bogenstahl, Johanna, Jennrich, Oliver, ...
This paper presents a procedure to perform fully autonomous on-orbit alignment of the interferometer on board the LISA Technology Package (LTP). LTP comprises two free-floating test masses as...
Status of GEO600 detector (2006)
Willke, Benno, Aufmuth, Peter, Aulbert, Carsten, Babak, S., Balasubramanian, R., Barr, B., ...
Of all the large interferometric gravitational-wave detectors, the German/British project GEO600 is the only one which uses dual recycling. During the four weeks of the international S4 data-taking...
Willke, Benno, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., Barr, B. W., ...
The GEO 600 gravitational wave detector uses advanced technologies including signal recycling and monolithic fused-silica suspensions to achieve a sensitivity close to the kilometre scale LIGO and...
Squeezed-field injection for gravitational wave interferometers (2006)
Vahlbruch, Henning, Chelkowski, Simon, Hage, Boris, Franzen, Alexander, Schnabel, Roman, Danzmann, Karsten
In a recent table-top experiment, we demonstrated the compatibility of three advanced interferometer techniques for gravitational wave detection, namely power-recycling, detuned signal recycling and...
Interferometry for the LISA technology package LTP: an update (2006)
Heinzel, Gerhard, Bogenstahl, Johanna, Braxmaier, Claus, Danzmann, Karsten, Garcia, Antonio C., Guzman, Felipe, ...
This paper gives an update on the status of the LISA technology package (LTP) which is to be launched in 2009 by ESA as a technology demonstration mission for the spaceborne gravitational wave...
Stabilized High Power Laser for Advanced Gravitational Wave Detectors (2006)
Willke, Benno, Danzmann, Karsten, Fallnich, Carsten, Frede, Maik, Heurs, Michele, King, Peter, ...
Second generation gravitational wave detectors require high power lasers with several 100W of output power and with very low temporal and spatial fluctuations. In this paper we discuss possible...
Diffractive Optics for Gravitational Wave Detectors (2006)
Bunkowski, Alexander, Burmeister, Oliver, Clausnitzer, Tina, Kley, Ernst-Bernhard, Tünnermann, Andreas, Danzmann, Karsten, ...
All-reflective interferometry based on nano-structured diffraction gratings offers new possibilities for gravitational wave detection. We investigate an all-reflective Fabry-Perot interferometer...
A photon pressure calibrator for the GEO 600 gravitational wave detector (2006)
Mossavi, Kasem, Hewitson, Martin, Hild, Stefan, Seifert, Frank, Weiland, U., Smith, J. R., ...
Interferometer mirror displacement induced by radiation pressure is used to demonstrate an alternative calibration method for the GEO 600 detector. The photon calibrator utilizes an amplitude...
Measurement of a low-absorption sample of OH-reduced fused silica (2006)
Hild, Stefan, Lück, Harald, Winkler, Walter, Strain, Ken A., Grote, Hartmut, Smith, Joshua R., ...
Low-absorption optics made of OH-reduced fused silica are a key technology for future gravitational wave detectors such as the Advanced LIGO. We developed a sensitive method to measure the absorption...
Coherent Control of Vacuum Squeezing in the Gravitational-Wave Detection Band (2006)
Vahlbruch, Henning, Chelkowski, Simon, Hage, Boris, Franzen, Alexander, Danzmann, Karsten, Schnabel, Roman
We propose and demonstrate a coherent control scheme for stable phase locking of squeezed vacuum fields. We focus on sideband fields at frequencies from 10 Hz to 10 kHz, which is a frequency regime...
Intensity and frequency noise reduction of a Nd:YAG NPRO via pump light stabilisation (2006)
Heurs, Michele, Meier, Tobias, Quetschke, V., Willke, Benno, Freitag, Ingo, Danzmann, Karsten
We have shown that pump light intensity stabilisation of a single-mode laser diode pumped Nd:YAG non-planar ring oscillator (NPRO) results in significant intensity noise reduction of the NPRO, as...
High reflectivity grating waveguide coatings for 1064 nm (2006)
Bunkowski, Alexander, Burmeister, Oliver, Friedrich, Daniel, Danzmann, Karsten, Schnabel, Roman
We propose thin single-layer grating waveguide structures to be used as high reflectivity, but low thermal noise, alternative to conventional coatings for gravitational wave detector test mass...
Search for gravitational waves from binary black hole inspirals in LIGO data (2006)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Ajith, P., ...
We report on a search for gravitational waves from binary black hole inspirals in the data from the second science run of the LIGO interferometers. The search focused on binary systems with component...
Joint LIGO and TAMA300 search for gravitational waves from inspiralling neutron star binaries (2006)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Ajith, P., ...
We search for coincident gravitational wave signals from inspiralling neutron star binaries using LIGO and TAMA300 data taken during early 2003. Using a simple trigger exchange method, we perform an...
Optical characterization of ultrahigh diffraction efficiency gratings (2006)
Bunkowski, Alexander, Burmeister, Oliver, Clausnitzer, Tina, Key, E. B., Tünnermann, Andreas, Danzmann, Karsten, ...
We report on the optical characterization of an ultrahigh diffraction efficiency grating in a first-order Littrow configuration. The apparatus used was an optical cavity built from the grating under...
Demonstration of three-port grating phase relations (2006)
Bunkowski, Alexander, Burmeister, Oliver, Danzmann, Karsten, Schnabel, Roman, Clausnitzer, Tina, Kley, Ernst-Bernhard, ...
We experimentally demonstrate the phase relations of three-port gratings by investigating three-port coupled Fabry-Perot cavities. Two different gratings that have the same first-order diffraction...
Status of the GEO600 detector (2006)
Lück, Harald, Hewitson, Martin, Ajith, P., Allen, Bruce, Aufmuth, Peter, Aulbert, Carsten, ...
Of all the large interferometric gravitational-wave detectors, the German/British project GEO600 is the only one which uses dual recycling. During the four weeks of the international S4 data-taking...
Spectral measurement of the caesium D2 line with a tunable heterodyne interferometer (2006)
Spani Molella, Luca, Rinkleff, Rolf-Hermann, Danzmann, Karsten
The optical properties of a caesium atomic beam driven on a resonant hyperfine transition in the D2 line were studied as a function of the probe laser frequency. Using a third off-resonant laser...
Laser power stabilization for second-generation gravitational wave detectors (2006)
Seifert, Frank, Kwee, Patrick, Heurs, Michele, Willke, Benno, Danzmann, Karsten
We present results on the power stabilization of a Nd:YAG laser in the frequency band from 1 Hz to 100 kHz. High-power, low-noise photodetectors are used in a dc-coupled control loop to achieve...
A widely tuneable and narrow linewidth diode laser for coherent spectroscopy (2006)
Wicht, A., Strauss, N., Ernsting, I., Chepurov, S., Schiller, S., Huke, P., ...
LISA Phasemeter development (2006)
Wand, Vinzenz, Guzman, Felipe, Heinzel, Gerhard, Danzmann, Karsten
The baseline concept of LISA had been developed within an industrial investigation by Astrium/EADS and is being reviewed since 2005 in an ongoing formulation phase. One of the most important key...
Components for the LISA local interferometry (2006)
Heinzel, Gerhard, Steier, Frank, Fleddermann, Roland, Sheard, Benjamin, Danzmann, Karsten
This article describes some preliminary results on essential components for the LISA interferometry, namely photodiode preamplifiers and voltage references.
Interferometric characterization of the optical window for LISA Pathfinder and LISA (2006)
Garcia Marin, Antonio Francisco, Bogenstahl, Johanna, Cervantes, Felipe Guzman, Steier, Frank, Reiche, Jens, Skorupka, Sascha, ...
In LISA Pathfinder and LISA the position fluctuations of drag free test masses will be determined interferometrically to picometer precision. To this end, laser light is brought to interference on an...
Search for gravitational-wave bursts in LIGO's third science run (2006)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Allen, Bruce, Amin, R., ...
We report on a search for gravitational-wave bursts in data from the three LIGO interferometric detectors during their third science run. The search targets sub-second bursts in the frequency range...
Advancing the optical feed back concept: Grating enhanced external cavity diode laser (2005)
Wicht,A., Huke,P., Rinkleff,Rolf-Hermann, Danzmann,Karsten
We present theoretical and experimental investigations on a new optical feedback concept for single mode diode lasers. It is based on the optical feedback from a resonant external cavity coupled to...
Input-output relations for a three-port grating coupled Fabry-Perot cavity (2005)
Bunkowski,Alexander, Burmeister,Oliver, Danzmann,Karsten, Schnabel,Roman
Phase locking to a LISA arm: first results on a hardware model (2005)
Garcia Marin,Antonio Francisco, Heinzel,Gerhard, Schilling,R., Rüdiger,A., Wand,Vinzenz, Steier,Frank, ...
We present the first experimental confirmation of the so-called 'self-phase-locked delay interferometry'. This laser frequency stabilization technique consists basically in comparing the prompt laser...
Experimental characterization of frequency-dependent squeezed light (2005)
Chelkowski,Simon, Vahlbruch,Henning, Hage,Boris, Franzen,Alexander, Lastzka,Nico, Danzmann,Karsten, ...
Successful testing of the LISA technology package (LTP) interferometer engineering model (2005)
Heinzel,Gerhard, Braxmaier,C., Caldwell,M., Danzmann,Karsten, Draaisma,F., Garcia,A., ...
The LISA Technology Package (LTP), to be launched by ESA in 2008, is a technology demonstration mission in preparation for the LISA spaceborne gravitational wave detector. A central part of the LTP...
Gravitational wave detectors (2005)
Aufmuth,Peter, Danzmann,Karsten
The existence of gravitational radiation is a prediction of Einstein's general theory of relativity. Gravitational waves are perturbations in the curvature of spacetime caused by accelerated masses....
The role of the coupling laser in electromagnetically induced absorption (2005)
Spani Molella,Luca, Rinkleff,Rolf-Hermann, Danzmann,Karsten
The cesium D2 line closed hyperfine transition F=4F=5 was simultaneously coupled and probed in a hot atomic beam. We experimentally showed that, when the probe laser frequency approached that of the...
Low-loss gratings for next-generation gravitational wave detectors (2005)
Clausnitzer,T., Tünnermann,A., Bunkowski,Alexander, Burmeister,Oliver, Danzmann,Karsten, ...
Ultra low-loss low-efficiency diffraction gratings (2005)
Clausnitzer,T., Tünnermann,A., Bunkowski,Alexander, Burmeister,Oliver, Danzmann,Karsten, ...
The realization of ultra low-loss dielectric reflection gratings with diffraction efficiencies between 7% and 0.02% is presented. By placing the grating beneath the highly reflective layerstack...
Advancing the optical feed back concept: Grating enhanced external cavity diode laser (2005)
Wicht, A., Huke, P., Rinkleff, Rolf-Hermann, Danzmann, Karsten
We present theoretical and experimental investigations on a new optical feedback concept for single mode diode lasers. It is based on the optical feedback from a resonant external cavity coupled to...
Input-output relations for a three-port grating coupled Fabry-Perot cavity (2005)
Bunkowski, Alexander, Burmeister, Oliver, Danzmann, Karsten, Schnabel, Roman
We analyze an optical three-port reflection grating by means of a scattering matrix formalism. Amplitude and phase relations among the three ports, i.e., the three orders of diffraction, are derived....
Phase locking to a LISA arm: first results on a hardware model (2005)
Garcia Marin, Antonio Francisco, Heinzel, Gerhard, Schilling, R., Rüdiger, A., Wand, Vinzenz, Steier, Frank, ...
We present the first experimental confirmation of the so-called 'self-phase-locked delay interferometry'. This laser frequency stabilization technique consists basically in comparing the prompt laser...
Experimental characterization of frequency-dependent squeezed light (2005)
Chelkowski, Simon, Vahlbruch, Henning, Hage, Boris, Franzen, Alexander, Lastzka, Nico, Danzmann, Karsten, ...
We report on the demonstration of broadband squeezed laser beams that show a frequency-dependent orientation of the squeezing ellipse. Carrier frequency as well as quadrature angle were stably locked...
Successful testing of the LISA technology package (LTP) interferometer engineering model (2005)
Heinzel, Gerhard, Braxmaier, Claus, Caldwell, Martin E., Danzmann, Karsten, Draaisma, F., Garcia Marin, Antonio Francisco, ...
The LISA Technology Package (LTP), to be launched by ESA in 2008, is a technology demonstration mission in preparation for the LISA spaceborne gravitational wave detector. A central part of the LTP...
Gravitational wave detectors (2005)
Aufmuth, Peter, Danzmann, Karsten
The existence of gravitational radiation is a prediction of Einstein's general theory of relativity. Gravitational waves are perturbations in the curvature of spacetime caused by accelerated masses....
Role of the coupling laser in electromagnetically induced absorption (2005)
Spani Molella, Luca, Rinkleff, Rolf-Hermann, Danzmann, Karsten
The cesium D2 line closed hyperfine transition F=4F=5 was simultaneously coupled and probed in a hot atomic beam. We experimentally showed that, when the probe laser frequency approached that of the...
Low-loss gratings for next-generation gravitational wave detectors (2005)
Clausnitzer, Tina, Kley, Ernst-Bernhard, Tünnermann, Andreas, Bunkowski, Alexander, Burmeister, Oliver, Danzmann, Karsten, ...
By combining electron beam lithography with coating processes, very shallow gratings with diffraction efficiencies between 0.02% and 7% have been realized. Advantages and disadvantages of different...
Ultra low-loss low-efficiency diffraction gratings (2005)
Clausnitzer, Tina, Kley, Ernst-Bernhard, Tünnermann, Andreas, Bunkowski, Alexander, Burmeister, Oliver, Danzmann, Karsten, ...
The realization of ultra low-loss dielectric reflection gratings with diffraction efficiencies between 7% and 0.02% is presented. By placing the grating beneath the highly reflective layerstack...
Upper limits from the LIGO and TAMA detectors on the rate of gravitational-wave bursts (2005)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Ajith, P., ...
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Allen, Bruce, ...
We perform a wide parameter-space search for continuous gravitational waves over the whole sky and over a large range of values of the frequency and the first spin-down parameter. Our search method...
Upper limits on gravitational wave bursts in LIGO's second science run (2005)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Agresti, Juri, Allen, Bruce, ...
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
We use data from the second science run of the LIGO gravitational-wave detectors to search for the gravitational waves from primordial black hole binary coalescence with component masses in the range...
Search for gravitational waves from galactic and extra-galactic binary neutron stars (2005)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
We use 373 hours ([approximate]15 days) of data from the second science run of the LIGO gravitational-wave detectors to search for signals from binary neutron star coalescences within a maximum...
Limits on gravitational-wave emission from selected pulsars using LIGO data (2005)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
Upper limits on a stochastic background of gravitational waves (2005)
Abbott, B., Abbott, R., Adhikari, R., Agresti, Juri, Ajith, P., Allen, Bruce, ...
The Laser Interferometer Gravitational-Wave Observatory has performed a third science run with much improved sensitivities of all three interferometers. We present an analysis of approximately 200...
The LTP experiment on the LISA Pathfinder mission (2005)
Anza, S., Armano, M., Balaguer, E., Benedetti, M., Boatella, C., Bosetti, P., ...
We report on the development of the LISA Technology Package (LTP) experiment that will fly onboard the LISA Pathfinder mission of the European Space Agency in 2008. We first summarize the science...
Phase locking to a LISA arm: first results on a hardware model (2005)
Garcia Marin, Antonio Francisco, Heinzel, Gerhard, Schilling, Roland, Rüdiger, Albrecht, Wand, Vinzenz, Steier, Frank, ...
We present the first experimental confirmation of the so-called 'self-phase-locked delay interferometry'. This laser frequency stabilization technique consists basically in comparing the prompt laser...
Optical transfer functions of kerr nonlinear cavities and interferometers (2005)
Rehbein, Henning, Harms, Jan, Schnabel, Roman, Danzmann, Karsten
We present the optical transfer functions for third-order nonlinear cavities that involve an optical carrier frequency and its modulation sideband fields. Our approach is based on linearized...
Vahlbruch, Henning, Chelkowski, Simon, Hage, Boris, Franzen, Alexander, Danzmann, Karsten, Schnabel, Roman
We report on the experimental combination of three advanced interferometer techniques for gravitational wave detection, namely, power recycling, detuned signal recycling, and squeezed field...
Analysis of a four-mirror-cavity enhanced Michelson interferometer (2005)
Thüring, Andre, Lück, Harald, Danzmann, Karsten
We investigate the shot-noise-limited sensitivity of a four-mirror-cavity enhanced Michelson interferometer. The intention of this interferometer topology is the reduction of thermal lensing and the...
Demonstration of a Squeezed-Light-Enhanced Power- and Signal-Recycled (2005)
Vahlbruch, Henning, Chelkowski, Simon, Hage, Boris, Franzen, Alexander, Danzmann, Karsten, Schnabel, Roman
We report on the experimental combination of three advanced interferometer techniques for gravitational wave detection, namely, power recycling, detuned signal recycling, and squeezed field...
First Edoardo Amaldi Conference on gravitational wave experiments (2005)
Danzmann, Karsten, Lück, Harald, Rüdiger, Albrecht, Schilling, Roland, Schrempel, M., Winkler, Walter, ...
Grote, Hartmut, Aufmuth, Peter, Aulbert, Carsten, Babak, S., Balasubramanian, R., Barr, B., ...
Since December 2003, the gravitational-wave detector GEO 600 has routinely operated in the dual recycled mode, using a lock acquisition scheme based on the detection of optical sideband power at the...
LISA pathfinder optical interferometry (2005)
Braxmaier, Claus, Heinzel, Gerhard, Middleton, Kevin, Caldwell, Martin E., Konrad, W., Stockburger, H., ...
The LISA Technology Package (LTP) aboard of LISA pathfinder mission is dedicated to demonstrate and verify key technologies for LISA, in particular drag free control, ultra-precise laser...
Grote, Hartmut, Allen, Bruce, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., ...
Since December 2003, the gravitational-wave detector GEO 600 has routinely operated in the dual recycled mode, using a lock acquisition scheme based on the detection of optical sideband power at the...
The LIGO gravitational wave obervatories: Recent results and future plans (2005)
Harry, G. M., Adhikari, R., Ballmer, S., Bayer, K., Betzwieser, J., Bochner, B., ...
Gravitational waves and massive black holes? The LISA and LISA pathfinder missions (2004)
Gianolio,A., Racca,G., Jennrich,O., Reinhard,R., Danzmann,Karsten, Vitale,S.
High power fundamental mode Nd : YAG laser with efficient birefringence compensation (2004)
Frede,M., Wilhelm,R., Brendel,M., Fallnich,C., Seifert,F., Willke,Benno, ...
The LTP interferometer and phasemeter (2004)
Heinzel,Gerhard, Wand,V., García,A., Jennrich,O., Braxmaier,C., Robertson,D., ...
The LISA Technology Package (LTP), to be launched by ESA in 2006/2007, is a technology demonstration mission in preparation for the LISA space-borne gravitational wave detector. A central part of the...
Automatic beam alignment for the modecleaner cavities of GEO 600 (2004)
Grote,Hartmut, Heinzel,Gerhard, Freise,Andreas, Goßler,Stefan, Willke,Benno, Lück,Harald, ...
The automatic alignment system for the two suspended, triangular mode-cleaner cavities of the gravitational wave detector GEO 600 has been in continuous operation since the spring of 2001. A total of...
Smith,Joshua R., Cagnoli,G., Crooks,D. R. M., Fejer,M. M., Goßler,Stefan, Lück,Harald, ...
Internal thermal noise is expected to be a limiting noise source in the most sensitive frequency band of the GEO 600 gravitational wave detector. Because thermal noise is directly related to energy...
Grating Enhanced External Cavity Diode Laser (2004)
Wicht,A., Rudolf,M., Huke,P., Rinkleff,Rolf-Hermann, Danzmann,Karsten
We describe a concept for diode lasers with optical feedback. It is based on the combination of two different diode laser concepts: the diode laser with (i) feedback from a grating and (ii) resonant...
The Hannover thermal noise experiment (2004)
Leonhardt,Volker, Ribichini,Luciano, Lück,Harald, Danzmann,Karsten
To analyse the thermal noise of the pendulum mode of a suspended mirror, we interferometrically detect the differential movement of two mirrors suspended as multiple-stage pendulums. We present the...
Towards dual recycling with the aid of time and frequency domain simulations (2004)
Malec,Michaela, Grote,Hartmut, Freise,Andreas, Heinzel,Gerhard, Strain,Kenneth A., Hough,Jim, ...
Abbott,B., Abbott,F., Adhikari,R., Ageev,A., Allen,Bruce, Amin,R., ...
For 17 days in August and September 2002, the LIGO and GEO interferometer gravitational wave detectors were operated in coincidence to produce their first data for scientific analysis. Although the...
Upper limits on the strength of periodic gravitational waves from PSR J1939+2134 (2004)
Woan,G., Allen,Bruce, Abbott,B., Abbott,F., Adhikari,R., Amin,R., ...
The first science run of the LIGO and GEO gravitational wave detectors presented the opportunity to test methods of searching for gravitational waves from known pulsars. Here we present new direct...
Willke,Benno, Aufmuth,Peter, Aulbert,Carsten, Babak,S., Balasubramanian,R., Barr,B., ...
The GEO 600 laser interferometer with 600 m armlength is currently being commissioned as a part of a worldwide network of gravitational wave detectors. Due to the use of advanced technologies such as...
Thermal correction of the radii of curvature of mirrors for GEO 600 (2004)
Lück,Harald, Freise,Andreas, Goßler,Stefan, Hild,Stefan, Kawabe,Keita, Danzmann,Karsten
A mismatch of the radii of curvature of the mirrors in the arms of an interferometric gravitational-wave detector can be partly compensated by creating a thermal gradient inside the mirror. This...
An algorithm to compute the transfer function of a mechanical system (2004)
Ribichini,Luciano, Leonhardt,Volker, Lück,Harald, Danzmann,Karsten
Reliable and efficient algorithms are needed to model complex mechanical systems such as multiple stage pendulum suspensions. A possible approach is the one based on the input–output formalism....
Frequency domain interferometer simulation with higher-order spatial modes (2004)
Freise,Andreas, Heinzel,Gerhard, Lück,Harald, Schilling,Roland, Willke,Benno, Danzmann,Karsten
FINESSE is a software simulation allowing one to compute the optical properties of laser interferometers used by interferometric gravitational-wave detectors today. This fast and versatile tool has...
Squeezed light for the interferometric detection of high frequency gravitational waves (2004)
Schnabel,Roman, Harms,Jan, Strain,Kenneth A., Danzmann,Karsten
The quantum noise of the light field is a fundamental noise source in interferometric gravitational-wave detectors. Injected squeezed light is capable of reducing the quantum noise contribution to...
Dual Recycling for GEO 600 (2004)
Grote,Hartmut, Freise,Andreas, Malec,Michaela, Heinzel,Gerhard, Willke,Benno, Lück,Harald, ...
Dual recycling is the combination of signal recycling and power recycling; both optical techniques improve the shot-noise-limited sensitivity of interferometric gravitational-wave detectors. In...
Alignment control of GEO 600 (2004)
Grote,Hartmut, Heinzel,Gerhard, Freise,Andreas, Goßler,Stefan, Willke,Benno, Lück,Harald, ...
We give an overview of the automatic mirror alignment system of the gravitational wave detector GEO 600. In order to achieve the required sensitivity of the Michelson interferometer, the axes of...
Damping and tuning of the fiber violin modes in monolithic silica suspensions (2004)
Goßler,Stefan, Cagnoli,G., Crooks,D.R.M., Lück,Harald, Rowan,S., Strain,Kenneth A., ...
High Q mirror suspensions are a key element of the advanced interferometric gravitational-wave detectors. In December 2002 the last of the final interferometer optics of GEO 600 were monolithically...
Calibration of the dual-recycled GEO600 detector for the S3 science run (2004)
Hewitson,Martin, Babak,S., Balasubramanian,R., Danzmann,Karsten, Grote,Hartmut, Heinzel,Gerhard, ...
The GEO 600 interferometric gravitational detector took part in an extended coincident science run of the LIGO Scientific Collaboration (S3) that started in November 2003. GEO had recently been...
Abbott,B., Abbott,F., Adhikari,R., Ageev,A., Allen,Bruce, Amin,R., ...
Data collected by the GEO 600 and LIGO interferometric gravitational wave detectors during their first observational science run were searched for continuous gravitational waves from the pulsar J1939...
Analysis of first LIGO science data for stochastic gravitational waves (2004)
Abbott,B., Abbott,F., Adhikari,R., Ageev,A., Allen,Bruce, Amin,R., ...
We present the analysis of between 50 and 100 h of coincident interferometric strain data used to search for and establish an upper limit on a stochastic background of gravitational radiation. These...
Analysis of LIGO data for gravitational waves from binary neutron stars (2004)
Abbott,B., Abbott,F., Adhikari,R., Ageev,A., Allen,Bruce, Amin,R., ...
We report on a search for gravitational waves from coalescing compact binary systems in the Milky Way and the Magellanic Clouds. The analysis uses data taken by two of the three LIGO interferometers...
Low-loss grating for coupling to a high-finesse cavity (2004)
Bunkowski,Alexander, Burmeister,Oliver, Beyersdorf,P., Danzmann,Karsten, Clausnitzer,T., Kley,E. B., ...
Squeezed light at sideband frequencies below 100 kHz from a single OPA (2004)
Schnabel,Roman, Vahlbruch,Henning, Franzen,Alexander, Chelkowski,Simon, Danzmann,Karsten
LIGO: S1 Science Results and Plans Beyond (2004)
Abbott,B., Abbott,F., Adhikari,R., Ageev,A., Allen,Bruce, Amin,R., ...
Grating Enhanced External Cavity Diode Laser (2004)
Wicht, A., Rudolf, M., Huke, P., Rinkleff, Rolf-Hermann, Danzmann, Karsten
We describe a concept for diode lasers with optical feedback. It is based on the combination of two different diode laser concepts: the diode laser with (i) feedback from a grating and (ii) resonant...
The Hannover thermal noise experiment (2004)
Leonhardt, Volker, Ribichini, Luciano, Lück, Harald, Danzmann, Karsten
To analyse the thermal noise of the pendulum mode of a suspended mirror, we interferometrically detect the differential movement of two mirrors suspended as multiple-stage pendulums. We present the...
Towards dual recycling with the aid of time and frequency domain simulations (2004)
Malec, Michaela, Grote, Hartmut, Freise, Andreas, Heinzel, Gerhard, Strain, Kenneth A., Hough, Jim, ...
The LTP interferometer and phasemeter (2004)
Heinzel, Gerhard, Wand, V., Garcia, Antonio C., Jennrich, Oliver, Braxmaier, Claus, Robertson, D., ...
The LISA Technology Package (LTP), to be launched by ESA in 2006/2007, is a technology demonstration mission in preparation for the LISA space-borne gravitational wave detector. A central part of the...
Smith, Joshua R., Cagnoli, G., Crooks, D. R. M., Fejer, M. M., Gossler, Stefan, Lück, Harald, ...
Internal thermal noise is expected to be a limiting noise source in the most sensitive frequency band of the GEO 600 gravitational wave detector. Because thermal noise is directly related to energy...
Abbott, B., Abbott, F., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
For 17 days in August and September 2002, the LIGO and GEO interferometer gravitational wave detectors were operated in coincidence to produce their first data for scientific analysis. Although the...
Upper limits on the strength of periodic gravitational waves from PSR J1939+2134 (2004)
Woan, G., Allen, Bruce, Abbott, B., Abbott, F., Adhikari, R., Amin, R., ...
The first science run of the LIGO and GEO gravitational wave detectors presented the opportunity to test methods of searching for gravitational waves from known pulsars. Here we present new direct...
Willke, Benno, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., Barr, B. W., ...
The GEO 600 laser interferometer with 600 m armlength is currently being commissioned as a part of a worldwide network of gravitational wave detectors. Due to the use of advanced technologies such as...
Thermal correction of the radii of curvature of mirrors for GEO 600 (2004)
Lück, Harald, Freise, Andreas, Gossler, Stefan, Hild, Stefan, Kawabe, Keita, Danzmann, Karsten
A mismatch of the radii of curvature of the mirrors in the arms of an interferometric gravitational-wave detector can be partly compensated by creating a thermal gradient inside the mirror. This...
An algorithm to compute the transfer function of a mechanical system (2004)
Ribichini, Luciano, Leonhardt, Volker, Lück, Harald, Danzmann, Karsten
Reliable and efficient algorithms are needed to model complex mechanical systems such as multiple stage pendulum suspensions. A possible approach is the one based on the input–output formalism....
Frequency domain interferometer simulation with higher-order spatial modes (2004)
Freise, Andreas, Heinzel, Gerhard, Lück, Harald, Schilling, Roland, Willke, Benno, Danzmann, Karsten
FINESSE is a software simulation allowing one to compute the optical properties of laser interferometers used by interferometric gravitational-wave detectors today. This fast and versatile tool has...
Squeezed light for the interferometric detection of high frequency gravitational waves (2004)
Schnabel, Roman, Harms, Jan, Strain, Kenneth A., Danzmann, Karsten
The quantum noise of the light field is a fundamental noise source in interferometric gravitational-wave detectors. Injected squeezed light is capable of reducing the quantum noise contribution to...
Dual Recycling for GEO 600 (2004)
Grote, Hartmut, Freise, Andreas, Malec, Michaela, Heinzel, Gerhard, Willke, Benno, Lück, Harald, ...
Dual recycling is the combination of signal recycling and power recycling; both optical techniques improve the shot-noise-limited sensitivity of interferometric gravitational-wave detectors. In...
Alignment control of GEO 600 (2004)
Grote, Hartmut, Heinzel, Gerhard, Freise, Andreas, Gossler, Stefan, Willke, Benno, Lück, Harald, ...
We give an overview of the automatic mirror alignment system of the gravitational wave detector GEO 600. In order to achieve the required sensitivity of the Michelson interferometer, the axes of...
Damping and tuning of the fiber violin modes in monolithic silica suspensions (2004)
Gossler, Stefan, Cagnoli, G., Crooks, D. R. M., Lück, Harald, Rowan, S., Strain, Kenneth A., ...
High Q mirror suspensions are a key element of the advanced interferometric gravitational-wave detectors. In December 2002 the last of the final interferometer optics of GEO 600 were monolithically...
Automatic beam alignment for the modecleaner cavities of GEO 600 (2004)
Grote, Hartmut, Heinzel, Gerhard, Freise, Andreas, Gossler, Stefan, Willke, Benno, Lück, Harald, ...
The automatic alignment system for the two suspended, triangular mode-cleaner cavities of the gravitational wave detector GEO 600 has been in continuous operation since the spring of 2001. A total of...
Squeezed light at sideband frequencies below 100 kHz from a single OPA (2004)
Schnabel, Roman, Vahlbruch, Henning, Franzen, Alexander, Chelkowski, Simon, Grosse, Nicolai B., Bachor, Hans-A., ...
Quantum noise of the electromagnetic field is one of the limiting noise sources in interferometric gravitational wave detectors. Shifting the spectrum of squeezed vacuum states downwards into the...
Calibration of the dual-recycled GEO600 detector for the S3 science run (2004)
Hewitson, Martin, Babak, Stanislav, Balasubramanian, R., Danzmann, Karsten, Grote, Hartmut, Heinzel, Gerhard, ...
The GEO 600 interferometric gravitational detector took part in an extended coincident science run of the LIGO Scientific Collaboration (S3) that started in November 2003. GEO had recently been...
Abbott, B., Abbott, F., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
Data collected by the GEO 600 and LIGO interferometric gravitational wave detectors during their first observational science run were searched for continuous gravitational waves from the pulsar J1939...
Analysis of first LIGO science data for stochastic gravitational waves (2004)
Abbott, B., Abbott, F., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
We present the analysis of between 50 and 100 h of coincident interferometric strain data used to search for and establish an upper limit on a stochastic background of gravitational radiation. These...
Analysis of LIGO data for gravitational waves from binary neutron stars (2004)
Abbott, B., Abbott, F., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
We report on a search for gravitational waves from coalescing compact binary systems in the Milky Way and the Magellanic Clouds. The analysis uses data taken by two of the three LIGO interferometers...
Low-loss grating for coupling to a high-finesse cavity (2004)
Bunkowski, Alexander, Burmeister, Oliver, Beyersdorf, P. T., Danzmann, Karsten, Clausnitzer, Tina, Kley, Ernst-Bernhard, ...
Squeezed light at sideband frequencies below 100 kHz from a single OPA (2004)
Schnabel, Roman, Vahlbruch, Henning, Franzen, Alexander, Chelkowski, Simon, Danzmann, Karsten
Quantum noise of the electromagnetic field is one of the limiting noise sources in interferometric gravitational wave detectors. Shifting the spectrum of squeezed vacuum states downwards into the...
Heurs, Michele, Quetschke, Volker, Willke, Benno, Danzmann, Karsten, Freitag, Ingo
We show that frequency and intensity noise in a Nd:YAG laser are correlated to a high degree and can be traced to the same underlying cause, namely, power fluctuations of the pump source. Because of...
First upper limits from LIGO on gravitational wave bursts (2004)
Abbott, B., Abbott, R., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
We report on a search for gravitational wave bursts using data from the first science run of the Laser Interferometer Gravitational Wave Observatory (LIGO) detectors. Our search focuses on bursts...
Gravitational waves and massive black holes? The LISA and LISA pathfinder missions (2004)
Gianolio, Alberto, Racca, Guiseppe, Jennrich, Oliver, Reinhard, Ruedeger, Danzmann, Karsten, Vitale, Stefano
High power fundamental mode Nd : YAG laser with efficient birefringence compensation (2004)
Frede, Maik, Wilhelm, Ralf, Brendel, Martina, Fallnich, Carsten, Seifert, Frank, Willke, Benno, ...
LIGO: S1 Science Results and Plans Beyond (2004)
Abbott, B., Abbott, F., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
Commissioning, characterization and operation of the dual-recycled GEO 600 (2004)
Smith, J. R., Allen, Bruce, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., ...
The German-British laser-interferometric gravitational-wave detector GEO 600 is currently being commissioned as part of a worldwide network of gravitational-wave detectors. GEO 600 recently became...
Strain, Kenneth A., Allen, Bruce, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., ...
The GEO 600 laser interferometer with 600m armlength is part of a worldwide network of gravitational wave detectors. GEO 600 is unique in having advanced multiple pendulum suspensions with a...
Finite mass beam splitter in high power interferometers (2004)
Harms, Jan, Schnabel, Roman, Danzmann, Karsten
The beam splitter in high-power interferometers is subject to significant radiation-pressure fluctuations. As a consequence, the phase relations which appear in the beam splitter coupling equations...
Analysis of LIGO data for gravitational waves from binary neutron stars (2004)
Abbott, B., Abbott, F., Adhikari, R., Ageev, A., Allen, Bruce, Amin, R., ...
We report on a search for gravitational waves from coalescing compact binary systems in the Milky Way and the Magellanic Clouds. The analysis uses data taken by two of the three LIGO interferometers...
A report on the status of the GEO 600 gravitational wave detector (2003)
Hewitson,M., Aufmuth,Peter, Aulbert,Carsten, Babak,S., Balasubramanian,R., Barr,B. W., ...
GEO 600 is an interferometric gravitational wave detector with 600 m arms, which will employ a novel, dual-recycled optical scheme allowing its optical response to be tuned over a range of...
Squeezed-input, optical-spring, signal-recycled gravitational-wave detectors (2003)
Harms, Jan, Chen, Yanbei, Chelkowski, Simon, Franzen, Alexander, Vahlbruch, Henning, Danzmann, Karsten, ...
We theoretically analyze the quantum noise of signal-recycled laser interferometric gravitational-wave detectors with additional input and output optics, namely frequency-dependent squeezing of the...
Interferometry for the LISA technology package (LTP) aboard SMART-2 (2003)
Heinzel,Gerhard, Schilling,Roland, Braxmaier,C., Rüdiger,Albrecht, Robertson,D., Te Plate,M., ...
The interferometer of the LISA technology package (LTP) on SMART-2 is needed to verify the performance of the gravitational sensors by monitoring the distance between two test masses with a noise...
Testing LISA drag-free control with the LISA technology package flight experiment (2003)
Bortoluzzi,D., Bosetti,P., Carbone,L., Cavalleri,A., Ciccollela,A., Da Lio,M., ...
The LISA test masses must be kept free of stray acceleration noise to within 3 × 10-15 m s-2 Hz-1/2 in order to obtain the low-frequency gravitational wave sensitivity goal. The LISA technology...
Squeezed-input, optical-spring, signal-recycled gravitational-wave detectors (2003)
Harms,Jan, Chen,Yanbei, Chelkowski,Simon, Franzen,Alexander, Vahlbruch,Henning, Danzmann,Karsten, ...
We theoretically analyze the quantum noise of signal-recycled laser interferometric gravitational-wave detectors with additional input and output optics, namely frequency-dependent squeezing of the...
Anomalous dispersion of transparent atomic two-, three-, and four-level ensembles (2003)
Rinkleff,Rolf-Hermann, Wicht,A., Spani Molella,Luca, Danzmann,Karsten
Detector characterization in GEO 600 (2003)
Sintes,Alicia M., Aufmuth,Peter, Aulbert,Carsten, Babak,S., Balasubramanian,R., Barr,B. W., ...
The GEO 600 interferometric gravitational wave detector conducted its first science run (S1) from 23 August 2002 to 9 September 2002. The GEO 600 data acquisition system is described together with...
LISA technology - concept, status, prospects (2003)
Danzmann,Karsten, Rüdiger,Albrecht
The existence of gravitational waves is the most prominent of Einstein's predictions that has not yet been directly verified. The space project LISA shares its goal and principle of operation with...
LISA - An ESA Cornerstone Mission for the Detection and Observation of Gravitational Waves (2003)
The primary objective of the Laser Interferometer Space Antenna (LISA) is to detect and observe gravitational waves from massive black holes, galactive binary stars, and violent events in the...
Interferometry for the LISA technology package (LTP) aboard SMART-2 (2003)
Heinzel, Gerhard, Schilling, Roland, Braxmaier, Claus, Rüdiger, Albrecht, Robertson, D., Te Plate, M., ...
The interferometer of the LISA technology package (LTP) on SMART-2 is needed to verify the performance of the gravitational sensors by monitoring the distance between two test masses with a noise...
Testing LISA drag-free control with the LISA technology package flight experiment (2003)
Bortoluzzi, D., Bosetti, P., Carbone, L., Cavalleri, A., Ciccolella, A., Da Lio, M., ...
The LISA test masses must be kept free of stray acceleration noise to within 3 × 10-15 m s-2 Hz-1/2 in order to obtain the low-frequency gravitational wave sensitivity goal. The LISA technology...
Status and Prospect of Laser-Interferometric Gravitational Wave Astronomy (2003)
Danzmann, Karsten, Rüdiger, Albrecht
The existence of gravitational waves is the most prominent of Einstein’s predictions that has not yet been directly verified. The space project LISA shares its goal and principle of operation with...
Squeezed-input, optical-spring, signal-recycled gravitational-wave detectors (2003)
Harms, Jan, Chen, Yanbei, Chelkowski, Simon, Franzen, Alexander, Vahlbruch, Henning, Danzmann, Karsten, ...
We theoretically analyze the quantum noise of signal-recycled laser interferometric gravitational-wave detectors with additional input and output optics, namely frequency-dependent squeezing of the...
A report on the status of the GEO 600 gravitational wave detector (2003)
Hewitson, Martin, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., Barr, B. W., ...
GEO 600 is an interferometric gravitational wave detector with 600 m arms, which will employ a novel, dual-recycled optical scheme allowing its optical response to be tuned over a range of...
Anomalous dispersion of transparent atomic two-, three-, and four-level ensembles (2003)
Rinkleff, Rolf-Hermann, Wicht, A., Spani Molella, Luca, Danzmann, Karsten
Detector characterization in GEO 600 (2003)
Sintes, Alicia M., Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., Barr, B. W., ...
The GEO 600 interferometric gravitational wave detector conducted its first science run (S1) from 23 August 2002 to 9 September 2002. The GEO 600 data acquisition system is described together with...
LISA technology - concept, status, prospects (2003)
Danzmann, Karsten, Rüdiger, Albrecht
The existence of gravitational waves is the most prominent of Einstein's predictions that has not yet been directly verified. The space project LISA shares its goal and principle of operation with...
LISA - An ESA Cornerstone Mission for the Detection and Observation of Gravitational Waves (2003)
Danzmann, Karsten, LISA Study Team
The primary objective of the Laser Interferometer Space Antenna (LISA) is to detect and observe gravitational waves from massive black holes, galactive binary stars, and violent events in the...
Status of the GEO600 gravitational wave detector (2003)
Willke, Benno, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., Barr, B. W., ...
The GEO600 laser interferometric gravitational wave detector is approaching the end of its commissioning phase which started in 1995.During a test run in January 2002 the detector was operated for 15...
Measuring a binary's orientation with LISA (2003)
Jennrich, Oliver, Peterseim, Michael, Danzmann, Karsten, Schutz, Bernard F.
We are presenting numerical results concerning LISA's ability to distinguish between different polarizational states of a gravitational wave. Therefore, we assume a binary as a source of a...
Position determination of gravitational wave sources with LISA (2003)
Jennrich, Oliver, Peterseim, Michael, Danzmann, Karsten, Schutz, Bernard F.
LISA is a spaceborne laser interferometer for the detection and observation of gravitational waves, currently under study by ESA. A brief introduction of the main features of this detector,...
Mode-cleaning and injection optics of the gravitational-wave detector GEO600 (2003)
Gossler, Stefan, Casey, Morag M., Freise, Andreas, Grant, A., Grote, Hartmut, Heinzel, Gerhard, ...
The British–German interferometric gravitational-wave detector GEO600 uses two high-finesse triangular ring cavities of 8 m optical pathlength each, as an optical mode-cleaning system. The...
Performance of a 1200 m long suspended Fabry-Perot cavity (2002)
Freise,Andreas, Casey,M. M., Gossler,Stefan, Grote,Hartmut, Heinzel,Gerhard, Lück,Harald, ...
Using one arm of the Michelson interferometer and the power recycling mirror of the interferometric gravitational wave detector GEO 600, we created a Fabry-Perot cavity with a length of 1200 m. The...
Dual recycling for GEO 600 (2002)
Heinzel,Gerhard, Freise,Andreas, Grote,Hartmut, Strain,Kenneth A., Danzmann,Karsten
Dual recycling is the combination of power recycling and signal recycling. GEO 600, a German-British interferometric gravitational wave detector being built in Germany, has no arm cavities and needs...
Silica research in Glasgow (2002)
Barr,B. W., Cagnoli,G., Casey,M. M., Clubley,D., Crooks,D. R. M., Danzmann,Karsten, ...
The Glasgow group is involved in the construction of the GE0600 interferometer as well as in R&D activity on technology for advanced gravitational wave detectors, GE0600 will be the first GW detector...
Towards measuring the off-resonant thermal noise of a pendulum mirror (2002)
Leonhardt,Volker, Ribichini,Luciano, Kloevekorn,P., Willke,Benno, Lück,Harald, Danzmann,Karsten
Thermal noise is one of the dominant noise sources in interferometric length measurements and can limit the sensitivity of gravitational wave detectors. Our goal is to analyse the off-resonant...
The GEO 600 laser system (2002)
Zawischa,I., Brendel,M., Danzmann,Karsten, Fallnich,Carsten, Heurs,Michele, Nagano,S., ...
Interferometric gravitational wave detectors require high optical power, single frequency lasers with very good beam quality and high amplitude and frequency stability as well as high long-term...
The modecleaner system and suspension aspects of GEO 600 (2002)
Gossler,Stefan, Casey,M. M., Freise,Andreas, Grote,Hartmut, Lück,Harald, McNamara,P. W., ...
GEO 600 uses two 8 m triangular ring cavities as a modecleaner system for the stabilization of the laser. To isolate the cavities with respect to the seismic noise the optical components are...
The automatic alignment system of GEO 600 (2002)
Grote,Hartmut, Heinzel,Gerhard, Freise,Andreas, Gossler,Stefan, Willke,Benno, Lück,Harald, ...
This paper gives an overview of the automatic mirror alignment system of the modecleaner and main interferometer of the GEO 600 gravitational wave detector. In order to achieve the required...
GEO 600 - Research, Progress and Prospects (2002)
Hough,Jim, Aufmuth,Peter, Balasubramanian,R., Barr,B. W., Brozec,O. S., Cagnoli,G., ...
The GEO 600 Gravitational Wave Detector (2002)
Willke,Benno, Aufmuth,Peter, Aulbert,Carsten, Babak,S., Balasubramanian,R., Barr,B. W., ...
The GEO 600 laser interferometer with 600 m armlength is part of a worldwide network of gravitational wave detectors. Due to the use of advanced technologies like multiple pendulum suspensions with a...
Data acquisition and detector characterization of GEO600 (2002)
Kötter,Karsten, Aulbert,Carsten, Babak,S., Balasubramanian,R., Berukoff,Steven, Bose,Sukanta, ...
The data acquisition system of the gravitational wave detector GEO600 is recording the first data now. Data from detector subsystems and environmental channels are being acquired. The data...
Auftakt zum Konzert der Sterne (2002)
Aufmuth,Peter, Danzmann,Karsten
Südlich von Hannover liegt eine astronomische Station der besonderen Art. Sie besteht nicht aus gewölbten Kuppeln oder riesigen Parabolantennen, sondern aus zwei 600 Meter langen rechtwinklig...
Anomalous dispersion of transparent atomic two- and three-level ensembles (2002)
Rocco,A., Wicht,A., Rinkleff,Rolf-Hermann, Danzmann,Karsten
The absorption and dispersion properties of a driven two-level atomic system probed by a weak field have been measured simultaneously with a phase modulated Mach-Zehnder interferometer. We find that...
Comparative study of anomalous dispersive transparent media (2002)
Wicht,A., Rinkleff,Rolf-Hermann, Spani Molella,Luca, Danzmann,Karsten
We present a comparative theoretical analysis of five different atomic schemes with respect to their performance as negative (anomalous) dispersive transparent media. The schemes discussed are the...
The GEO 600 Gravitational Wave Detector (2002)
Willke, Benno, Aufmuth, Peter, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., Barr, B. W., ...
The GEO 600 laser interferometer with 600 m armlength is part of a worldwide network of gravitational wave detectors. Due to the use of advanced technologies like multiple pendulum suspensions with a...
Data acquisition and detector characterization of GEO600 (2002)
Kötter, Karsten, Aulbert, Carsten, Babak, Stanislav, Balasubramanian, R., Berukoff, Steven J., Bose, Sukanta, ...
The data acquisition system of the gravitational wave detector GEO600 is recording the first data now. Data from detector subsystems and environmental channels are being acquired. The data...
GEO 600 - Research, Progress and Prospects (2002)
Hough, Jim, Aufmuth, Peter, Balasubramanian, R., Barr, B. W., Brozek, Oliver Sascha, Cagnoli, G., ...
Auftakt zum Konzert der Sterne (2002)
Aufmuth, Peter, Danzmann, Karsten
Südlich von Hannover liegt eine astronomische Station der besonderen Art. Sie besteht nicht aus gewölbten Kuppeln oder riesigen Parabolantennen, sondern aus zwei 600 Meter langen rechtwinklig...
Performance of a 1200 m long suspended Fabry-Perot cavity (2002)
Freise, Andreas, Casey, Morag M., Gossler, Stefan, Grote, Hartmut, Heinzel, Gerhard, Lück, Harald, ...
Using one arm of the Michelson interferometer and the power recycling mirror of the interferometric gravitational wave detector GEO 600, we created a Fabry-Perot cavity with a length of 1200 m. The...
Dual recycling for GEO 600 (2002)
Heinzel, Gerhard, Freise, Andreas, Grote, Hartmut, Strain, Kenneth A., Danzmann, Karsten
Dual recycling is the combination of power recycling and signal recycling. GEO 600, a German-British interferometric gravitational wave detector being built in Germany, has no arm cavities and needs...
Silica research in Glasgow (2002)
Barr, B. W., Cagnoli, G., Casey, Morag M., Clubley, D., Crooks, D. R. M., Danzmann, Karsten, ...
The Glasgow group is involved in the construction of the GE0600 interferometer as well as in R&D activity on technology for advanced gravitational wave detectors, GE0600 will be the first GW detector...
Towards measuring the off-resonant thermal noise of a pendulum mirror (2002)
Leonhardt, Volker, Ribichini, Luciano, Kloevekorn, P., Willke, Benno, Lück, Harald, Danzmann, Karsten
Thermal noise is one of the dominant noise sources in interferometric length measurements and can limit the sensitivity of gravitational wave detectors. Our goal is to analyse the off-resonant...
The GEO 600 laser system (2002)
Zawischa, I., Brendel, Martina, Danzmann, Karsten, Fallnich, Carsten, Heurs, Michele, Nagano, S., ...
Interferometric gravitational wave detectors require high optical power, single frequency lasers with very good beam quality and high amplitude and frequency stability as well as high long-term...
Anomalous dispersion of transparent atomic two- and three-level ensembles (2002)
Rocco, A., Wicht, A., Rinkleff, Rolf-Hermann, Danzmann, Karsten
The absorption and dispersion properties of a driven two-level atomic system probed by a weak field have been measured simultaneously with a phase modulated Mach-Zehnder interferometer. We find that...
Comparative study of anomalous dispersive transparent media (2002)
Wicht, A., Rinkleff, Rolf-Hermann, Spani Molella, Luca, Danzmann, Karsten
We present a comparative theoretical analysis of five different atomic schemes with respect to their performance as negative (anomalous) dispersive transparent media. The schemes discussed are the...
The modecleaner system and suspension aspects of GEO 600 (2002)
Gossler, Stefan, Casey, Morag M., Freise, Andreas, Grote, Hartmut, Lück, Harald, McNamara, P. W., ...
GEO 600 uses two 8 m triangular ring cavities as a modecleaner system for the stabilization of the laser. To isolate the cavities with respect to the seismic noise the optical components are...
The automatic alignment system of GEO 600 (2002)
Grote, Hartmut, Heinzel, Gerhard, Freise, Andreas, Gossler, Stefan, Willke, Benno, Lück, Harald, ...
This paper gives an overview of the automatic mirror alignment system of the modecleaner and main interferometer of the GEO 600 gravitational wave detector. In order to achieve the required...
The GEO 600 Gravitational Wave Detector - Status, Research, Development (2001)
Rüdiger,Albrecht, Danzmann,Karsten
The last few years have brought a great break-through in the quest for earth-bound detection of gravitational waves: at five sites, laser-interferometric detectors, of armlengths from 0.3 to 4 km,...
Heterodyne measurement of parametric dispersion in electromagnetically induced transparency (2001)
Müller,M., Homann,F., Rinkleff,Rolf-Hermann, Wicht,A., Danzmann,Karsten
Using three phase-locked lasers, we have observed in a three-level system the phase shift of the frequency fixed coupling laser in dependence of the probe laser frequency relative to an off-resonant...
Gravitational wave detection by laser interferometry - on earth and in space (2001)
Rüdiger,Albrecht, Brillet,Alain, Danzmann,Karsten, Giazotto,Adalberto, Hough,Jim
The space project LISA is approved by ESA as a cornerstone mission in the field of 'fundamental physics', sharing its goal and principle of operation with the groundbased interferometers currently...
The GEO 600 Gravitational Wave Detector - Status, Research, Development (2001)
Rüdiger, Albrecht, Danzmann, Karsten
The last few years have brought a great break-through in the quest for earth-bound detection of gravitational waves: at five sites, laser-interferometric detectors, of armlengths from 0.3 to 4 km,...
Heterodyne measurement of parametric dispersion in electromagnetically induced transparency (2001)
Müller, M., Homann, F., Rinkleff, Rolf-Hermann, Wicht, A., Danzmann, Karsten
Using three phase-locked lasers, we have observed in a three-level system the phase shift of the frequency fixed coupling laser in dependence of the probe laser frequency relative to an off-resonant...
Gravitational wave detection by laser interferometry - on earth and in space (2001)
Rüdiger, Albrecht, Brillet, Alain, Danzmann, Karsten, Giazotto, Adalberto, Hough, Jim
The space project LISA is approved by ESA as a cornerstone mission in the field of 'fundamental physics', sharing its goal and principle of operation with the groundbased interferometers currently...
Gravitational wave detectors on the ground and in space (2001)
Small prototypes of gravitational wave detectors have been under development for over 30 years. But it is only now that we have the necessary technology available to build large instruments with good...
Demonstration of detuned dual recycling at the Garching 30 m laser interferometer (2000)
Freise,Andreas, Heinzel,Gerhard, Strain,Kenneth A., Mizuno,J., Skeldon,K. D., Lück,Harald, ...
Dual recycling is an advanced optical technique to enhance the signal-to-noise ratio of laser interferometric gravitational wave detectors in a limited bandwidth. To optimise the center of this band...
Willke,Benno, Brozek,S., Danzmann,Karsten, Quetschke,Volker, Gossler,Stefan
The frequency of a 700-mW monolithic nonplanar Nd:YAG ring laser (NPRO) depends, with a large coupling coefficient (megahertz per milliwatt), on the power of its laser-diode pump source. Using this...
Experimental demonstration of negative dispersion without absorption (2000)
Wicht,A., Müller,M., Rinkleff,Rolf-Hermann, Rocco,A., Danzmann,Karsten
We present the results of an experiment proving in principle that negative (anomalous) dispersive transparent media can be realized. The Ca-transition 4s(2) S-1(0) --> 4s4p(1)P(1) at lambda = 423 nm...
Correction of wavefront distortions by means of thermally adaptive optics (2000)
Lück,Harald, Aufmuth,Peter, Danzmann,Karsten
A new method for the correction of wavefront distortions in laser interferometers is proposed. In contrast to the usual adaptive correction, by means of piezoelectric actuators, a high power laser...
LISA interferometer sensitivity to spacecraft motion (2000)
Peterseim,Michael, Robertson,D. F., Danzmann,Karsten, Welling,H., Bender,P.
A study has been performed to assess the sensitivity of the LISA interferometer to motion of the spacecraft (S/C) with respect to the proof mass. The results are presented as a functions of arm...
A phase-modulated interferometer for high-precision spectroscopy (2000)
Wicht,A., Müller,M., Rinkleff,Rolf-Hermann, Rocco,A., Danzmann,Karsten, Quetschke,Volker
We present a novel spectroscopic method based on a phase-modulated interferometer which is suitable for the high-precision measurement of absorption and index of refraction profiles. A comparison...
The GEO 600 laser source: a 12 W frequency-stabilised injection-locked Nd:YAG laser system (2000)
Brozek,Oliver Sascha, Zawischa,Ivo, Peterseim,Michael, Quetschke,Volker, Fallnich,Carsten, Willke,Benno, ...
The GEO 600 gravitational wave detector (2000)
Willke,Benno, Aufmuth,Peter, Balasubramanian,R., Brozek,Oliver Sacha, Cagnoli,G., Casey,M, ...
The GEO stabilized laser system and the current-lock technique (2000)
Willke,Benno, Brozek,O. S., Danzmann,Karsten, Fallnich,Carsten, Goßler,Stefan, Lück,Harald, ...
GEO 600 slave laser prototype II (2000)
Zawischa,I., Brozek,O.S, Quetschke,Volker, Fallnich,Carsten, Willke,Benno, Danzmann,Karsten, ...
The laser system for the LISA technology demonstrator (2000)
Brozek,O.S, Peterseim,Michael, Danzmann,Karsten, Fallnich,Carsten, Welling,H.
Parametric dispersion in electromagnetically induced transparency (2000)
Müller,M., Homann,F., Rinkleff,Rolf-Hermann, Wicht,A., Danzmann,Karsten
We analyze both experimentally and theoretically the phase shift of a fixed coupling laser field in a -type system induced by a tunable probe laser field. The measurements are performed with a...
The GEO 600 laser system (2000)
Brozek,O. S., Zawischa,I., Peterseim,Michael, Willke,Benno, Danzmann,Karsten
Correction of wavefront distortions by means of thermally adaptive optics (2000)
Lück, Harald, Aufmuth, Peter, Danzmann, Karsten
A new method for the correction of wavefront distortions in laser interferometers is proposed. In contrast to the usual adaptive correction, by means of piezoelectric actuators, a high power laser...
Danzmann, Karsten, LISA Study Team
More than 80 years ago, Einstein has predicted that accelerated masses will emit gravitational waves, propagating distortions of the spacetime fabric. The gravitational wave spectrum of known and...
LISA interferometer sensitivity to spacecraft motion (2000)
Peterseim, Michael, Robertson, D. I., Danzmann, Karsten, Welling, H., Bender, P. L.
A study has been performed to assess the sensitivity of the LISA interferometer to motion of the spacecraft (S/C) with respect to the proof mass. The results are presented as a functions of arm...
Experimental demonstration of negative dispersion without absorption (2000)
Wicht, A., Müller, M., Rinkleff, Rolf-Hermann, Rocco, A., Danzmann, Karsten
We present the results of an experiment proving in principle that negative (anomalous) dispersive transparent media can be realized. The Ca-transition 4s(2) S-1(0) --> 4s4p(1)P(1) at lambda = 423 nm...
A phase-modulated interferometer for high-precision spectroscopy (2000)
Wicht, A., Müller, M., Rinkleff, Rolf-Hermann, Rocco, A., Danzmann, Karsten, Quetschke, Volker
We present a novel spectroscopic method based on a phase-modulated interferometer which is suitable for the high-precision measurement of absorption and index of refraction profiles. A comparison...
The GEO 600 laser source: a 12 W frequency-stabilised injection-locked Nd:YAG laser system (2000)
Brozek, Oliver Sascha, Zawischa, Ivo, Peterseim, Michael, Quetschke, Volker, Fallnich, Carsten, Willke, Benno, ...
The GEO 600 gravitational wave detector (2000)
Willke, Benno, Aufmuth, Peter, Balasubramanian, R., Brozek, Oliver Sascha, Cagnoli, G., Casey, Morag M., ...
The GEO stabilized laser system and the current-lock technique (2000)
Willke, Benno, Brozek, Oliver Sascha, Danzmann, Karsten, Fallnich, Carsten, Gossler, Stefan, Lück, Harald, ...
GEO 600 slave laser prototype II (2000)
Zawischa, I., Brozek, Oliver Sascha, Quetschke, Volker, Fallnich, Carsten, Willke, Benno, Danzmann, Karsten, ...
The laser system for the LISA technology demonstrator (2000)
Brozek, Oliver Sascha, Peterseim, Michael, Danzmann, Karsten, Freitag, Ingo, Fallnich, Carsten, Welling, H.
Willke, Benno, Brozek, Oliver Sascha, Danzmann, Karsten, Quetschke, Volker, Gossler, Stefan
The frequency of a 700-mW monolithic nonplanar Nd:YAG ring laser (NPRO) depends, with a large coupling coefficient (megahertz per milliwatt), on the power of its laser-diode pump source. Using this...
Parametric dispersion in electromagnetically induced transparency (2000)
Müller, M., Homann, F., Rinkleff, Rolf-Hermann, Wicht, A., Danzmann, Karsten
We analyze both experimentally and theoretically the phase shift of a fixed coupling laser field in a -type system induced by a tunable probe laser field. The measurements are performed with a...
Demonstration of detuned dual recycling at the Garching 30 m laser interferometer (2000)
Freise, Andreas, Heinzel, Gerhard, Strain, Kenneth A., Mizuno, J., Skeldon, K. D., Lück, Harald, ...
Dual recycling is an advanced optical technique to enhance the signal-to-noise ratio of laser interferometric gravitational wave detectors in a limited bandwidth. To optimise the center of this band...
The GEO 600 laser system (2000)
Brozek, Oliver Sascha, Zawischa, I., Peterseim, Michael, Willke, Benno, Danzmann, Karsten
Schutz, Bernard F., Lück, Harald, Aufmuth, Peter, Brozek, Oliver Sascha, Danzmann, Karsten, Freise, Andreas, ...
GEO600, the German/British gravitational wave detector currently being built in northern Germany, used advanced optical technologies to obtain a sensitivity comparable with the other, bigger...
Heinzel, Gerhard, Rüdiger, Albrecht, Schilling, Roland, Strain, Kenneth A., Winkler, Walter, Mizuno, J., ...
We describe a system for complete autoalignment of a suspended, power-recycled Michelson interferometer. All ten angular degrees of freedom are controlled by servo systems, thus ensuring optimal...
Laser interferometric gravitational wave detectors spanning 7 decades of frequency (1999)
Strain, Kenneth A., Casey, Morag M., Hough, J., McNamara, P. W., Newton, G., Plissi, M. V., ...
Heinzel, Gerhard, Strain, Kenneth A., Mizuno, J., Skeldon, K. D., Willke, Benno, Winkler, Walter, ...
The advanced scheme of “signal recycling” is to be used in the British-German GEO 600 project, in addition to “power recycling” (which has become standard for all laser-interferometer...
Brozek, Oliver Sascha, Quetschke, V., Wicht, A., Danzmann, Karsten
We report on 50% conversion efficiency for frequency doubling of a 854 nm GaAlAs diode laser using a potassium niobate crystal in an external ring cavity. Frequency stabilization of the diode laser...
LISA and ground-based detectors for gravitational waves: an overview (1998)
Danzmann, Karsten, LISA Study Team
The gravitational wave spectrum covers many decades in frequency. Sources in the audio-frequency regime above 1 Hz are accessible to ground-based detectors while sources in the low-frequency regime...
Laser development and laser stabilisation for the space-borne gravitational wave (1998)
Peterseim, Michael, Brozek, Oliver Sascha, Danzmann, Karsten, Freitag, Ingo, Rottengatter, P., Tünnermann, Andreas, ...
The laser system for the gravitational wave detector GEO 600 (1998)
Brozek, Oliver Sascha, Peterseim, Michael, Danzmann, Karsten, Willke, Benno, Freitag, Ingo, Knoke, S.
Automatic beam alignment at the Garching 30 m prototype (1998)
Heinzel, Gerhard, Mizuno, J., Winkler, Walter, Rüdiger, Albrecht, Schilling, Roland, Danzmann, Karsten
Earthbound and deep space operation of laser metrology (1998)
Peterseim, Michael, Brozek, Oliver Sascha, Danzmann, Karsten, Tünnermann, Andreas, Freitag, Ingo
Angular resolution of LISA (1997)
Peterseim, Michael, Jennrich, Oliver, Danzmann, Karsten, Schutz, Bernard F.
LISA is a space-borne, laser-interferometric gravitational wave detector currently under study by the European Space Agency. We give a brief introduction about the main features of the detector,...
Polarization resolution of LISA (1997)
Jennrich, Oliver, Peterseim, Michael, Danzmann, Karsten, Schutz, Bernard F.
We discuss LISA's ability to resolve different polarizational states of a gravitational wave with fixed frequency and amplitude. Assuming a binary as the source of the gravitational wave, its...
GEO 600: Current Status and Some Aspects of the Design (1997)
Hough, J., Newton, G. P., Robertson, N. A., Ward, H., Plissi, M., Robertson, D., ...
Optical resonator with steep internal dispersion (1997)
Müller, G., Müller, M., Wicht, A., Rinkleff, Rolf-Hermann, Danzmann, Karsten
We present an optical resonator with modified properties due to a nonabsorbing highly dispersive medium. The steep nonabsorbing dispersion is created with an additional pump field in an atomic beam...
LISA - an ESA cornerstone mission for a gravitational wave observatory (1997)
Danzmann, Karsten, LISA Study Team
The European Space Agency has selected LISA, a gravitational wave observatory, as a cornerstone mission in its future science program Horizons 2000. This observatory will complement the development...
On negative dispersion without absorption in bichromatically driven two-level systems (1997)
Szymanowski, Carsten, Wicht, Andreas, Danzmann, Karsten
The possibility of obtaining strong negative dispersion without absorption in the central resonance structure of the spectrum of a bichromatically driven two-level system is investigated. A nonlinear...
Resonant sideband extraction for detectors with Fabry-Perot arms (1997)
Heinzel, Gerhard, Mizuno, J., Schilling, Roland, Winkler, Walter, Rüdiger, Albrecht, Danzmann, Karsten
Monolithically suspended fused silica substrates with very high mechanical Q (1997)
Traeger, S., Willke, Benno, Danzmann, Karsten
To minimize thermal noise in gravitational-wave detectors high mechanical quality factors are required for the suspended test masses. Monolithic suspensions are proposed for advanced detectors...
White-light cavities, atomic phase coherence, and gravitational wave detectors (1997)
Wicht, A., Danzmann, Karsten, Fleischhauer, M., Scully, M., Müller, G., Rinkleff, Rolf-Hermann
We propose a new concept to realize optical cavities with large buildup but broadband response (white-light cavities) using atomic phase coherence. We demonstrate that strongly driven double-Λ...
Frequency response of Michelson- and Sagnac-based interferometers (1997)
Mizuno, J., Rüdiger, Albrecht, Schilling, Roland, Winkler, Walter, Danzmann, Karsten
The frequency response of Michelson- and Sagnac-based interferometers are evaluated and compared, considering the application for gravitational-wave detection. It is shown that Sagnac-based...
Nicholson,David, Dickson,C. A., Watkins,W. John, Schutz,Bernard F., Shuttleworth,Justin R., Jones,G. S., ...
We report an upper bound on the strain amplitude of gravitational wave bursts in a waveband from around 800 Hz to 1.25 kHz. In an effective coincident observing period of 62 hours, the prototype...
Nicholson, David, Dickson, C. A., Watkins, W. John, Schutz, Bernard F., Shuttleworth, Justin R., Jones, G., ...
We report an upper bound on the strain amplitude of gravitational wave bursts in a waveband from around 800 Hz to 1.25 kHz. In an effective coincident observing period of 62 hours, the prototype...
LISA: laser interferometer space antenna for gravitational wave measurements (1996)
Hough, Jim, Bender, P. L., Brillet, Alain, Ciufolini, I., Danzmann, Karsten, Hellings, Ronald, ...
LISA (laser interferometer space antenna) is designed to observe gravitational waves from violent events in the Universe in a frequency range from to which is totally inaccessible to ground-based...
Nicholson, David, Dickson, C. A., Watkins, W. John, Schutz, Bernard F., Shuttleworth, Justin R., Jones, G. S., ...
We report an upper bound on the strain amplitude of gravitational wave bursts in a waveband from around 800 Hz to 1.25 kHz. In an effective coincident observing period of 62 hours, the prototype...
Accuracy of parameter estimation of gravitational waves with LISA (1996)
Peterseim, Michael, Jennrich, Oliver, Danzmann, Karsten
LISA is a space-borne, laser-interferometric gravitational-wave detector currently under study by the European Space Agency. We give a brief introduction about the main features of the detector,...
A new kind of heterodyne measurement of coherent population trapping in an atomic beam (1996)
Müller, G., Wicht, A., Rinkleff, Rolf-Hermann, Danzmann, Karsten
A new heterodyne technique is presented for the simultaneous measurement of dispersion and absorption of atomic transitions useful especially for coherent two photon transitions. This technique is...
Heterodyne laser tracking at high Doppler rates (1996)
Hellings, Ronald, Giampieri, Giacomo, Maleki, Lute, Tinto, Massimo, Danzmann, Karsten, Hough, James, ...
A design is described for a transmitter/receiver system that may be used in a spaceborne laser heterodyne tracking system to produce a high-precision interferometer. We present a two-color laser...
LISA: laser interferometer space antenna for gravitational wave measurements (1996)
Danzmann, Karsten, LISA Study Team
LISA (laser interferometer space antenna) is designed to observe gravitational waves from violent events in the Universe in a frequency range from to which is totally inaccessible to ground-based...
Heinzel, Gerhard, Mizuno, J., Schilling, Roland, Winkler, Walter, Rüdiger, Albrecht, Danzmann, Karsten
Resonant sideband extraction is a new optical configuration for laser-interferometric gravitational wave detectors with Fabry-Perot cavities in the arms. It reduces the thermal load on the beam...
GEO 600. A 600 m Laser Interferometric Gravitational Wave Antenna (1995)
Danzmann,Karsten, Lück,Harald, Rüdiger,Albrecht, Schilling,Roland, Schrempel,M., Winkler,Walter, ...
GEO 600. A 600 m Laser Interferometric Gravitational Wave Antenna (1995)
Danzmann, Karsten, Lück, Harald, Rüdiger, Albrecht, Schilling, Roland, Schrempel, M., Winkler, Walter, ...
LISA : Laser Interferometer Space Antenna for gravitational wave measurements (1995)
Danzmann, Karsten, LISA Study Team
LISA (Laser Interferometer Space Antenna) is designed to observe gravitational waves from violent events in the Universe in a frequency range from 10−4 to 10−1 Hz which is totally inaccessible to...
Light scattering described in the mode picture (1994)
Winkler, Walter, Schilling, Roland, Danzmann, Karsten, Mizuno, J., Rüdiger, Albrecht, Strain, Kenneth A.
A system of orthonormal functions representing the eigenmodes of an optical resonator with perfectly spherical mirror surfaces has been described in the literature. In real experiments, however, the...
Birefringence-induced losses in interferometers (1994)
Winkler, Walter, Rüdiger, Albrecht, Schilling, Roland, Strain, Kenneth A., Danzmann, Karsten
In interferometers one conceivable loss mechanism is depolarization of the light by inherent or thermally induced birefringence in optical substrates or coatings. The magnitude of this effect is...
Thermal lensing in recycling interferometric gravitational wave detectors (1994)
Strain, Kenneth A., Danzmann, Karsten, Mizuno, J., Nelson, P. G., Rüdiger, Albrecht, Schilling, Roland, ...
Thermal lensing limits the performance of advanced interferometric gravitational wave detectors that use high light powers. We evaluate the effects of thermal lensing in such systems and estimate...
GEO 600. Proposal for a 600 m Laser-Interferometric Gravitational Wave Antenna (1994)
Danzmann, Karsten, Lück, Harald, Rüdiger, Albrecht, Schilling, Roland, Schrempel, M., Winkler, Walter, ...
Measurement of the positronium 13S1-23S1 interval by continuous-wave two-photon excitation (1993)
Fee, Michale S., Mills, A. P., Chu, Steven, Shaw, E. D., Danzmann, Karsten, Chichester, R. J., ...
Using continuous-wave excitation to eliminate the problems inherent with pulsed laser measurements of nonlinear transitions, we have measured the 13S1-23S1 interval in positronium (Ps) to be 1 233...
Pulsar search using data compression with the Garching gravitational wave detector (1993)
Niebauer, T. M., Rüdiger, Albrecht, Schilling, Roland, Schnupp, L., Winkler, Walter, Danzmann, Karsten
We describe briefly the standard problems associated with the detection of a periodic signal of astrophysical origin. We present a method for data compression when the bandwidth of the expected...
Measurement of the positronium 1 3S1–2 3S1 interval by continuous-wave two-photon excitation (1993)
Fee, Michale S., Chu, Steven, Mills, A. P., Chichester, R. J., Zuckerman, D. M., Shaw, E. D., ...
Positronium is the quasistable bound system consisting of an electron and its antiparticle, the positron. Its energy levels can be explained to a high degree of accuracy by the electromagnetic...
Danzmann, Karsten, Rüdiger, Albrecht, Schilling, Roland, Winkler, Walter, Hough, J., Bender, P. L., ...
Mizuno, J., Strain, Kenneth A., Nelson, P. G., Chen, J. M., Schilling, Roland, Rüdiger, Albrecht, ...
We introduce a new Fabry-Perot based interferometric gravitational wave detector that, compared with previous designs, greatly decreases the amount of power that must be transmitted through optical...
The GEO-Project A Long-Baseline Laser Interferometer for the Detection of Gravitational Waves (1992)
Danzmann,Karsten, Chen,J., Nelson,P. G., Niebauer,T. M., Rüdiger,Albrecht, Schilling,Roland, ...
The GEO-project a long-baseline laser interferometer for the detection of gravitational waves (1992)
Danzmann, Karsten, Chen, J. M., Nelson, P. G., Niebauer, T. M., Rüdiger, Albrecht, Schilling, Roland, ...
Mechanical Aspects in Interferometric Gravity Wave Detectors (1992)
Rüdiger, Albrecht, Schutz, Bernard F., Danzmann, Karsten, Ehlers, Jürgen
Optical heterodyne measurement of pulsed lasers: Toward high-precision pulsed spectroscopy (1992)
Fee, Michale S., Danzmann, Karsten, Chu, Steven
In this paper we explore theoretically and experimentally the effect of fluctuations in the instantaneous frequency of a pulsed laser on the shape and position of two-photon transition spectra. The...
Gauntt, David M., Danzmann, Karsten
We have measured the intensities and polarizations of fine-structure lines in the N=9-8 manifolds of Ne viii and Ar viii spectra produced in collisions of Ne8+ and Ar8+ (v=0.05–0.15 a.u.) with...
The optics of an interferometric gravitational-wave antenna (1992)
Winkler, Walter, Chen, J. M., Danzmann, Karsten, Nelson, P. G., Niebauer, T. M., Rüdiger, Albrecht, ...
The basic concept of an interferometric gravitational wave detector, the realization of the long light path with optical delay lines or with Fabry-Perot cavities, and the need for high light power...
Mechanical aspects in interferometric gravity wave detectors (1992)
Winkler, Walter, Chen, J. M., Danzmann, Karsten, Nelson, P. G., Niebauer, T. M., Rüdiger, Albrecht, ...
In order to measure the tiny effects of gravitational waves, strains in space (i.e. relative changes in distance) of as little as 10-21 or even less have to be detected, at frequencies ranging from...
Optical problems in interferometric gravitational wave antennas (1992)
Winkler, Walter, Danzmann, Karsten, Rüdiger, Albrecht, Schilling, Roland
Nonstationary shot noise and its effect on the sensitivity of interferometers (1991)
Niebauer, T. M., Schilling, Roland, Danzmann, Karsten, Rüdiger, Albrecht, Winkler, Walter
We treat the shot noise of a light source modulated in power as a nonstationary random process. The spectrum of such modulated shot noise, although it is still white, is shown to contain correlations...
Fee, Michale S., Mills, A. P., Shaw, E. D., Chichester, R. J., Zuckerman, D. M., Chu, Steven, ...
Using a spatially filtered pulsed laser at 486 nm we have photoexcited positronium to the 2S state and detected it via a delayed and spatially separated 532-nm photoionization pulse. We have extended...
Winkler, Walter, Danzmann, Karsten, Rüdiger, Albrecht, Schilling, Roland
The ultimate sensitivity of interferometric gravitational-wave detectors requires extremely high light powers sensing the separation of test masses. Absorption of light at the optical components...
Danzmann, Karsten, Meyerhof, W. E., Belkacem, A., Montenegro, E. C., Dillard, E., Hülskötter, H. P., ...
We have searched for three-photon decays produced in 6-MeV/nucleon U+Th, Th+Th, and U+U collisions. We see no evidence for narrow lines corresponding to the electron-positron lines seen by others: in...
Unified set of atomic transition probabilities for neutral argon (1989)
Wiese, W. L., Brault, J. W., Danzmann, Karsten, Helbig, V., Kock, Manfred
The atomic transition probabilities and radiative lifetimes of neutral argon have been the subject of numerous experiments and calculations, but the results exhibit many discrepancies and...
Correlated two-photon lines from 6-MeV/nucleon U+Th, U+U, and Th+Th collisions (1989)
Danzmann, Karsten, Meyerhof, W. E., Montenegro, E. C., Dillard, E., Hülskötter, H. P., Guardala, N., ...
We find that narrow lines at 1043 and 1062 keV in the summed-energy, 180°-correlated two-photon spectrum from ≊6-MeV/nucleon U+Th collisions can be produced by cascades from high-spin states (32+)...
Danzmann, Karsten, Fee, Michale S., Chu, Steven
A scheme for a precision measurement of the 1S-2S transition frequency in positronium and muonium is reported, and corrections to the two most recent experiments are presented which bring their...
Danzmann, Karsten, Günther, Mathias, Fischer, Joachim, Kock, Manfred, Kühne, Michael
A high current hollow cathode source has been developed as a radiometric source standard for the extreme VUV. The source is operated at a constant current of 2 A with an aluminum cathode and helium...
Lembo, L. J., Danzmann, Karsten, Stoller, Ch., Meyerhof, W. E., Hansch, T. W.
Polarization measurements have been performed and emission spectra in the visible and near ultraviolet have been acquired for transitions between Rydberg states of slow, highly charged neon ions...
Xu, Xiang-Yuan, Montenegro, E. C., Anholt, R., Danzmann, Karsten, Meyerhof, W. E., Schlachter, A. S., ...
Projectile K-shell ionization and excitation cross sections were measured for 8.6-MeV/amu Ca19+,18+ beams incident on various gas targets. The ionization and excitation cross sections are compared...
Intermediate-velocity atomic collisions. III. Electron capture in 8.6- MeV/amu Ca ions (1988)
Montenegro, E. C., Xu, Xiang-Yuan, Meyerhof, W. E., Anholt, R., Danzmann, Karsten, Schlachter, A. S., ...
Electron-capture cross sections by 8.6-MeV/amu Ca18+, Ca19+, and Ca20+ beams were measured in gas targets from H2 to Xe. Measurements were made of total electron capture as well as of electron...
180°-correlated equal-energy photons from 5.9-MeV/nucleon U + Th collisions (1987)
Danzmann, Karsten, Meyerhof, W. E., Montenegro, E. C., Xu, Xiang-Yuan, Dillard, E., Hülskötter, H. P., ...
We have found a narrow line (intrinsic width ≤2.5 keV) at 1062±1 keV in the summed-energy 180°-c.m.-correlated two-photon spectrum from 5.95-MeV/nucleon U+Th collisions. Including possible...
Optical spectroscopy of highly ionized neon (1987)
Lembo, L. J., Stoller, Ch., Danzmann, Karsten, Meyerhof, W. E., Hänsch, T. W., Gerson, R.
Optical spectroscopy studies have been performed on slow, highly charged neon recoil ions. Rydberg states were populated by electron capture from sodium. These spectra reveal the influence of core...
Optical Spectroscopy of slow, higly ionized atoms (1987)
Lembo, L. J., Danzmann, Karsten, Meyerhof, W. E., Hänsch, T. W.
Meyerhof, W. E., Molitoris, J. D., Danzmann, Karsten, Spooner, D. W., Stephens, F. S., Diamond, R. M., ...
We have searched for 180° (c.m.) correlated equal-energy two-photon decays produced in 6-MeV/nucleon U + Th collisions. In the summed-energy region between 1.5 and 1.8 MeV, we set an upper limit of...
Danzmann, Karsten, Grützmacher, K., Wende, B.
It is demonstrated that Doppler-free two-photon polarization spectroscopy makes possible Stark profile measurements without Doppler-broadened background under high-density and high-temperature...
Improved Ar(II) transition probabilities (1986)
Danzmann, Karsten, Kock, Manfred
Precise Ar(II) branching ratios have been measured on a high current hollow cathode with a 1-m Fourier transform spectrometer. Absolute transition probabilities for 11 Ar(II) lines were calculated...
Oscillator strengths of neutral and singly ionised molybdenum (1986)
Schnehage, S. E., Danzmann, Karsten, Künnemeyer, R., Kock, Manfred
Oscillator strengths of 174 Mo(I) and 58 Mo(II) lines in the range 2470–5570 Å were obtained from wall-stabilised arc and hollow cathode measurements. Sets of relative f-values were determined by...
SOFT X-RAY LASER CAVITIES (1986)
Ceglio, N. M., Stearns, D. G., Hawryluk, A. M., Barbee, T. W., Danzmann, Karsten, Kühne, Michael, ...
We report progress in the development of multilayer components for use in multiple pass soft x-ray laser cavities operating in the 100Å-300Å spectral range. Our work includes fabrication and...
A high-current hollow cathode as a source of intense line radiation in the VUV (1985)
Danzmann, Karsten, Fischer, Joachim, Kühne, Michael
The VUV line emission of a high-current DC hollow cathode was investigated in the wavelength region 10 nm to 100 nm. Spectra of quadruply ionised atoms could be observed. The radiance in the Al IV...
Lembo, L. J., Danzmann, Karsten, Stoller, Ch., Meyerhof, W. E., Hänsch, T. W.
In charge-transfer collisions of 4-keV Ne8+ recoil ions with Na, we have observed 434-nm photons emitted in the n=9 to 8 transition in Ne7+. We find this radiation to be strongly polarized, with a...
Argon branching ratios for spectral intensity calibration: a reply (1982)
Danzmann, Karsten, Kock, Manfred
Branching ratios have been obtained for 33 lines originating from nine levels in Ar II by Fourier spectroscopic measurements on a high-current hollow cathode. The values are compared with recent...
Population densities in a titanium hollow cathode (1981)
Danzmann, Karsten, Kock, Manfred
Measurements are reported of population densities in the energy level systems of neutral and singly ionised titanium. The discharge under investigation was a high-current hollow cathode operated in...
Oscillator strengths of Ti II from combined hook and emission measurements (1980)
Danzmann, Karsten, Kock, Manfred
It is demonstrated that a large set of accurate oscillator strengths of Ti II can be determined from a combination of hook and emission measurements without any assumption concerning the plasma...
Oscillator strengths of TI I from hook and emission measurements (1978)
Kühne, Michael, Danzmann, Karsten, Kock, Manfred
A method combining emission measurements of lines from a common upper level with hook measurements of lines from a common lower level has been applied to obtain 24 relative f-values of Ti I resonance...
A solar abundance study using recent TI I oscillator strengths (1978)
Gehlsen, M., Holweger, H., Danzmann, Karsten, Kock, Manfred, Kühne, Michael
LISA: laser interferometer space antenna for gravitational wave measurements
Hough,Jim, Bender,P., Brillet,A., Ciufolini,I., Danzmann,Karsten, Hellings,R., ...
LISA (laser interferometer space antenna) is designed to observe gravitational waves from violent events in the Universe in a frequency range from to which is totally inaccessible to ground-based...
Squeezed light at sideband frequencies below 100 kHz from a single OPA
Schnabel,Roman, Vahlbruch,Henning, Franzen,Alexander, Chelkowski,Simon, Grosse,Nicolai, ...
Quantum noise of the electromagnetic field is one of the limiting noise sources in interferometric gravitational wave detectors. Shifting the spectrum of squeezed vacuum states downwards into the...
Demonstration of 3-port grating phase relations
Bunkowski, Alexander, Burmeister, Oliver, Danzmann, Karsten, Schnabel, Roman, Clausnitzer, T., ...
Real-time phase-front detector for heterodyne interferometers
Guzmán Cervantes, Felipe, Heinzel, Gerhard, García Marín, Antonio F., Wand, Vinzenz, Steier, Frank, Jennrich, Oliver, ...
We present a real-time differential phase-front detector sensitive to better than 3 mrad rms, which corresponds to a precision of approximately 500 pm. This detector performs a spatially resolving...
100% reflectivity from a monolithic dielectric microstructured surface
Brückner, Frank, Clausnitzer, Tina, Burmeister, Oliver, Friedrich, Daniel, Kley, Ernst-Bernhard, Danzmann, Karsten, ...
Here, we propose a new mirror architecture which is solely based upon a monolithic dielectric micro-structured surface. Hence, the mirror device, which consists of a possibly mono-crystalline bulk...
Laser power stabilization using optical ac coupling and its quantum and technical limits
Kwee, Patrick, Willke, Benno, Danzmann, Karsten
We demonstrate an active power stabilization of a Nd:YAG laser employing the optical ac-coupling scheme and derive its fundamental quantum limit. This limit is 3 dB better than the one encountered in...