Ronald Holzwarth

Cavity-enhanced dual-comb spectroscopy (2009)

Bernhardt, Birgitta, Ozawa, Akira, Jacquet, Patrick, Jacquey, Marion, Kobayashi, Yohei, Udem, Thomas, ...

The sensitivity of molecular fingerprinting is dramatically improved when placing the absorbing sample in a high-finesse optical cavity, thanks to the large increase of the effective path-length. As...

Phase- coherent comparison of two optical frequency standards over 146 km using a telecommunication fiber link (2009)

Terra, Osama, Grosche, Gesine, Predehl, Katharina, Holzwarth, Ronald, Legero, Thomas, Sterr, Uwe, ...

We have explored the performance of two "dark fibers" of a commercial telecommunication fiber link for a remote comparison of optical clocks. The two fibers, linking the Leibniz University of Hanover...

Cavity-enhanced dual-comb spectroscopy (2009)

Bernhardt, Birgitta, Ozawa, Akira, Jacquet, Patrick, Jacquey, Marion, Kobayashi, Yohei, Udem, Thomas, ...

The sensitivity of molecular fingerprinting is dramatically improved when placing the absorbing sample in a high-finesse optical cavity, thanks to the large increase of the effective path-length. As...

Cavity-enhanced dual-comb spectroscopy (2009)

Bernhardt, Birgitta, Ozawa, Akira, Jacquet, Patrick, Jacquey, Marion, Kobayashi, Yohei, Udem, Thomas, ...

The sensitivity of molecular fingerprinting is dramatically improved when placing the absorbing sample in a high-finesse optical cavity, thanks to the large increase of the effective path-length. As...

Laser frequency combs for astronomical observations (2008)

Steinmetz, Tilo, Wilken, Tobias, Araujo-Hauck, Constanza, Holzwarth, Ronald, Hänsch, Theodor W., Pasquini, Luca, ...

A direct measurement of the universe's expansion history could be made by observing in real time the evolution of the cosmological redshift of distant objects. However, this would require...

Frequency-comb-referenced two-wavelength source for absolute distance measurement (2008)

Schuhler, Nicolas, Salvadé, Yves, Lévêque, Samuel, Dändliker, René, Holzwarth, Ronald

We propose a new tunable laser source concept for multiple-wavelength interferometry, offering an unprecedented large choice of synthetic wavelengths with a relative uncertainty better than 10−11...

Frequency-comb-referenced two-wavelength source for absolute distance measurement (2008)

Schuhler, Nicolas, Salvadé, Yves, Lévêque, Samuel, Dändliker, René, Holzwarth, Ronald

We propose a new tunable laser source concept for multiple-wavelength interferometry, offering an unprecedented large choice of synthetic wavelengths with a relative uncertainty better than 10−11...

High harmonic frequency combs for high resolution spectroscopy (2008)

Ozawa, Akira, Rauschenberger, Jens, Gohle, Christoph, Herrmann, Maximilian, Walker, David R., Pervak, Volodymyr, ...

We generated a series of harmonics in a xenon gas jet inside a cavity seeded by pulses from a Ti:sapphire mode-locked laser with a repetition rate of 10.8 MHz. Harmonics up to 19th order at 43 nm...

Laser frequency combs for astronomical observations (2008)

Steinmetz, Tilo, Wilken, Tobias, Araujo-Hauck, Constanza, Holzwarth, Ronald, Hänsch, Theodor W., Pasquini, Luca, ...

A direct measurement of the universe's expansion history could be made by observing in real time the evolution of the cosmological redshift of distant objects. However, this would require...

Laser frequency combs for astronomical observations (2008)

Steinmetz, Tilo, Wilken, Tobias, Araujo-Hauck, Constanza, Holzwarth, Ronald, Hänsch, Theodor W., Pasquini, Luca, ...

A direct measurement of the universe's expansion history could be made by observing in real time the evolution of the cosmological redshift of distant objects. However, this would require...

Laser frequency combs for astronomical observations (2008)

Steinmetz, Tilo, Wilken, Tobias, Araujo-Hauck, Constanza, Holzwarth, Ronald, Hänsch, Theodor W., Pasquini, Luca, ...

A direct measurement of the universe's expansion history could be made by observing in real time the evolution of the cosmological redshift of distant objects. However, this would require...

Laser frequency combs for astronomical observations (2008)

Steinmetz, Tilo, Wilken, Tobias, Araujo-Hauck, Constanza, Holzwarth, Ronald, Hänsch, Theodor W., Pasquini, Luca, ...

A direct measurement of the universe's expansion history could be made by observing in real time the evolution of the cosmological redshift of distant objects. However, this would require...

Measuring the Frequency of Light using (2007)

Femtosecond Laser Pulses, Ronald Holzwarth, Victor Hugo

In the course of this work a new technique to measure the frequency of light has been developed, implemented and refined.

Future wavelength calibration standards at ESO : the Laser Frequency Comb (2007)

Araujo-Hauck, Constanza, Pasquini, Luca, Manescau, Antonio, Udem, Thomas, Hänsch, Theodor W., Holzwarth, Ronald, ...

A new technique for precise wavelength calibration of high-resolution spectrographs using frequency combs has recently been proposed. After introducing the basic concepts and advantages of this...

High-precision wavelength calibration of astronomical spectrographs with laser frequency combs (2007)

Murphy, Michael T., Udem, Thomas, Holzwarth, Ronald, Sizmann, Andreas, Pasquini, Luca, Araujo-Hauck, Costanza, ...

We describe a possible new technique for precise wavelength calibration of high-resolution astronomical spectrographs using femtosecond-pulsed mode-locked lasers controlled by stable oscillators such...

Future wavelength calibration standards at ESO : the Laser Frequency Comb (2007)

Araujo-Hauck, Constanza, Pasquini, Luca, Manescau, Antonio, Udem, Thomas, Hänsch, Theodor W., Holzwarth, Ronald, ...

A new technique for precise wavelength calibration of high-resolution spectrographs using frequency combs has recently been proposed. After introducing the basic concepts and advantages of this...

High-precision wavelength calibration of astronomical spectrographs with laser frequency combs (2007)

Murphy, Michael T., Udem, Thomas, Holzwarth, Ronald, Sizmann, Andreas, Pasquini, Luca, Araujo-Hauck, Costanza, ...

We describe a possible new technique for precise wavelength calibration of high-resolution astronomical spectrographs using femtosecond-pulsed mode-locked lasers controlled by stable oscillators such...

Future wavelength calibration standards at ESO : the Laser Frequency Comb (2007)

Araujo-Hauck, Constanza, Pasquini, Luca, Manescau, Antonio, Udem, Thomas, Hänsch, Theodor W., Holzwarth, Ronald, ...

A new technique for precise wavelength calibration of high-resolution spectrographs using frequency combs has recently been proposed. After introducing the basic concepts and advantages of this...

High-precision wavelength calibration of astronomical spectrographs with laser frequency combs (2007)

Murphy, Michael T., Udem, Thomas, Holzwarth, Ronald, Sizmann, Andreas, Pasquini, Luca, Araujo-Hauck, Costanza, ...

We describe a possible new technique for precise wavelength calibration of high-resolution astronomical spectrographs using femtosecond-pulsed mode-locked lasers controlled by stable oscillators such...

High-precision wavelength calibration of astronomical spectrographs with laser frequency combs (2007)

Murphy, Michael T., Udem, Thomas, Holzwarth, Ronald, Sizmann, Andreas, Pasquini, Luca, Araujo-Hauck, Costanza, ...

We describe a possible new technique for precise wavelength calibration of high-resolution astronomical spectrographs using femtosecond-pulsed mode-locked lasers controlled by stable oscillators such...

Future wavelength calibration standards at ESO : the Laser Frequency Comb (2007)

Araujo-Hauck, Constanza, Pasquini, Luca, Manescau, Antonio, Udem, Thomas, Hänsch, Theodor W., Holzwarth, Ronald, ...

A new technique for precise wavelength calibration of high-resolution spectrographs using frequency combs has recently been proposed. After introducing the basic concepts and advantages of this...

High-precision wavelength calibration of astronomical spectrographs with laser frequency combs (2007)

Murphy, Michael T., Udem, Thomas, Holzwarth, Ronald, Sizmann, Andreas, Pasquini, Luca, Araujo-Hauck, Costanza, ...

We describe a possible new technique for precise wavelength calibration of high-resolution astronomical spectrographs using femtosecond-pulsed mode-locked lasers controlled by stable oscillators such...

Future wavelength calibration standards at ESO : the Laser Frequency Comb (2007)

Araujo-Hauck, Constanza, Pasquini, Luca, Manescau, Antonio, Udem, Thomas, Hänsch, Theodor W., Holzwarth, Ronald, ...

A new technique for precise wavelength calibration of high-resolution spectrographs using frequency combs has recently been proposed. After introducing the basic concepts and advantages of this...

Photoionization broadening of the 1S-2S transition in a beam of atomic hydrogen (2006)

Kolachevsky, Nikolai, Haas, Martin, Jentschura, Ulrich David, Herrmann, Maximilian, Fendel, Peter, Fischer, Marc, ...

We consider the excitation dynamics of the two-photon 1S-2S transition in a beam of atomic hydrogen by 243 nm laser radiation. Specifically, we study the impact of ionization damping on the...

New Limits on the Drift of Fundamental Constants from Laboratory Measurements (2004)

Fischer,M., Kolachevsky,Nikolai, Zimmermann,Marcus, Holzwarth,Ronald, Udem,Thomas, Hänsch,Theodor W., ...

We have remeasured the absolute 1S-2S transition frequency H in atomic hydrogen. A comparison with the result of the previous measurement performed in 1999 sets a limit of (–29±57) Hz for the...

Optical Synchronization Systems for Femtosecond X-ray Sources (2004)

Wilcox, Russell, Staples, John W., Holzwarth, Ronald

In femtosecond pump/probe experiments using short X-Ray and optical pulses, precise synchronization must be maintained between widely separated lasers in a synchrotron or FEL facility. We are...

New Limits on the Drift of Fundamental Constants from Laboratory Measurements (2004)

Fischer, M., Kolachevsky, Nikolai, Zimmermann, Marcus, Holzwarth, Ronald, Udem, Thomas, Hänsch, Theodor W., ...

We have remeasured the absolute 1S-2S transition frequency H in atomic hydrogen. A comparison with the result of the previous measurement performed in 1999 sets a limit of (–29±57) Hz for the...

New Limits on the Drift of Fundamental Constants from Laboratory Measurements (2004)

Fischer, M., Kolachevsky, Nikolai, Zimmermann, Marcus, Holzwarth, Ronald, Udem, Thomas, Hänsch, Theodor W., ...

We have remeasured the absolute 1S-2S transition frequency H in atomic hydrogen. A comparison with the result of the previous measurement performed in 1999 sets a limit of (–29±57) Hz for the...

Measuring the Frequency of Light using Femtosecond Laser Pulses (2001)

Holzwarth, Ronald

In the course of this work a new technique to measure the frequency of light has been developed, implemented and refined. For all time and frequency measurements the SI second defined by the cesium...

Measuring the Frequency of Light using Femtosecond Laser Pulses (2001)

Holzwarth, Ronald

In the course of this work a new technique to measure the frequency of light has been developed, implemented and refined. For all time and frequency measurements the SI second defined by the cesium...