A flow reactor has been used to measure the room temperature rate constants for quenching of NF(a(sub1) Delta) by molecules containing the NF bond and by SiF4, HNCO, and NCO. The quenching rate...
Anordnung zur Transformation eines optischen Strahlungsfelds (2005)
Hoffmann, D., Traub, M., Meyer, R., Du, K.
WO2005006054 A UPAB: 20050311 NOVELTY - The light beam (1) leaving the end of the optical fiber (11) proceeds in the Z-direction and is symmetrical in the X- and Y-directions. The beam diverges from...
Optische Verstaerker-Anordnung (2005)
Du, K., Loosen, P., Poprawe, R.
WO 200074185 A UPAB: 20010716 NOVELTY - An amplifying device (1) has an approximately rectangular cross section and long and short edges. Two highly reflective mirrors (2,3) sit either side the...
Verfahren zur Modifizierung von Materialeigenschaften (2004)
DE 10232815 A UPAB: 20040316 NOVELTY - Process for modifying material properties comprises impinging the zone to be modified with a power pulse directly before a processing pulse. The power pulse has...
Anordnung zum Multiplexing und/oder Demultiplexing (2004)
Du, K., Loosen, P., Poprawe, R.
DE 10122010 A UPAB: 20020626 NOVELTY - The arrangement has at least one polarizing element, whereby the waves enter the polarizing element linearly polarized. Statistically polarized waves are...
Correlations between structural and optical properties of GaInNAs quantum wells grown by MBE (2003)
Chauveau,J. M., Trampert,A., Pinault,M. A., Tournie,E., Du,K., Ploog,K. H.
Laser machining by short and ultrashort pulses, state of the art (2003)
Meijer, J., Du, K., Hoffmann, D., Kovalenko, V.S., Ostendorf, A., Poprawe, R., ...
Correlations between structural and optical properties of GaInNAs quantum wells grown by MBE (2003)
Chauveau, J. M., Trampert, A., Pinault, M. A., Tournie, E., Du, K., Ploog, K. H.
Compact high-power diode laser pump modules for intersatellite communications (2003)
Traub, M., Du, K., Poprawe, R.
High reliable diode laser pump modules are essential for free-space optical telecommunications. Besides the reliability, low mass and small dimensions, radiation-hardness and low power-consumption...
Anordnung zur Fuehrung und Formung von Strahlen eines geradlinigen Laserdiodenarrays (2003)
An arrangement for guiding and shaping rays of a straight-line laser diode array having ray exit facets lying in a common plane by means of reflecting optics. In order to project the rays of the...
The device includes a reflective block (5) onto which at least two parallel output radiation field parts of a one or two dimensional array (3) of solid state or semiconductor lasers are directed. The...
Thermal stability of stacked self-assembled InP quantum dots in GaInP (2002)
Jin-Phillipp, N. Y., Du, K., Phillipp, F., Zundel, M., Eberl, K.
Thermal stability of stacked self-assembled InP quantum dots in GaInP (2002)
Jin-Phillipp, N. Y., Du, K., Phillipp, F., Zundel, M., Eberl, K.
Thermal stability of stacked self-assembled InP quantum dots (QDs) embedded in Ga0.51In0.49P (GaInP) under ex situ rapid thermal annealing (RTA) is studied by photoluminescence spectroscopy and...
Optisch gepumpter Verstaerker, insbesondere ein Festkoerper-Verstaerker (2002)
The apparatus includes a solid state laser with Nd:YAG crystal that has a square cross section (2) and which is located between two resonator mirrors (3). Located perpendicular to the resonator axis...
Meijer, J., Du, K., Gillner, A., Hoffmann, D., Kovalenko, V.S., Masuzawa, T., ...
An overview is given of the applications of short and ultrashort lasers in material processing. Shorter pulses reduce heat-affected damage of the material and opens new ways for nanometer accuracy....
QHREM study on thermal stability of stacked self-assembled InP quantum dots (2001)
Jin-Phillipp, N. Y., Zundel, M., Du, K., Phillipp, F., Eberl, K.
QHREM study of thermal stability of stacked self-assembled InP quantum dots (2001)
Jin-Phillipp, N. Y., Zundel, M. K., Du, K., Phillipp, F., Eberl, K.
Thermal stability of stacked self-assembled InP quantum dots (QDs) is studied by quantitative high-resolution electron microscopy (QHREM). The size and the shape of the QDs as well as local lattice...
Scaling the output power of a diode end pumped ND:YAG slab laser with a hybrid resonator (2000)
Schmidt, G., Schnitzler, C., Giesekus, J., Wester, R., Du, K., Loosen, P., ...
This report deals with a Nd:YAG slab laser that is partially end pumped by a diode laser stack with 14 diode lasers. The pumped volume has a rectangular cross section. A hybrid resonator, which is...
Beam shaping of high-power diode lasers (2000)
Du, K., Baumann, M., Luft, A., Röhner, M., Traub, M.
The main advantages of diode lasers are their small size, long life time, high efficiency and frequency controllability. At the moment the obtainable output power from a typical 200 æm emitter is...
Axial line scanning device for display and printing applications (2000)
Falter, S., Kubaink, J., Du, K., Loosen, P., Poprawe, R.
Conventional two dimensional scanning methods operate by a two axis variable mirror system to deflect onel aser beam over the whole image field. Hence there occur two different deflection...
UV beam sources for double pulse generation (2000)
Falter, S., Du, K., Loosen, P., Poprawe, R.
An even higher integration in semiconductor technology can be realized with a memory technology based on thin film ferroelectrical materials. Because these materials are usually transparent to light...
Highly efficient diode end pumped Nd:YAG slab laser (2000)
Giesekus, J., Schmidt, G., Schnitzler, C., Mans, T., Wester, R., Du, K., ...
High power diode pumped solid state lasers are auspicious sources for various applications in material processing. The solid state laser we report on is a Nd:YAG slab laser, that is partially end...
Endgekuehlte Verstaerker bzw. Lasersysteme (2000)
Du, K., Loosen, P., Poprawe, R.
DE 19860921 A UPAB: 20000823 NOVELTY - The active laser medium comprises a cooling surface (2) which lies in thermal contact with a heat sink (1) to cool the medium. The laser medium is held...
Apertur fuer Laserstrahlung hoher Strahlungsdichte (1999)
Du, K., Poprawe, R., Loosen, P.
DE 19910725 A UPAB: 19991124 NOVELTY - The aperture (1) absorbs between 0 and 1 per cent of the laser radiation for a defined aperture thickness. A region of the aperture surface deflects or couples...
Vorrichtung und Verfahren zur Erzeugung von Teilstrahlen fuer einen Linienscanner (1999)
Falter, S., Du, K., Loosen, P., Poprawe, R.
NOVELTY - The line scanner has a first beam guide (1) along a guide line and one or more decouplers of partial beams (3) from the first beam at several positions (2) along the guide line. One or more...
Du, K., Loosen, P., Poprawe, R.
The system comprises at least one laser as a light source, an acousto-optical scanner, and a reproduction optical system. At least one laser beam with an axial or Z-propagation direction is coupled...
Partially end-pumped Nd:YAG slab laser with a hybrid resonator (1998)
Du, K., Wu, N., Xu, J., Giesekus, J., Loosen, P., Poprawe, R.
A Nd:YAG slab is partially end pumped by a diode laser stack with three diode laser bars. The pumped volume has a rectangular cross section. A hybrid resonator which is stable in the plane of small...
Du, K., Loosen, P., Poprawe, R., Yu, X.
The laser device has several diodes which emit laser light preferably low order mode light. The diodes are arranged in a plane parallel to each other and at a distance (D) from each other. The diode...
Falter, S., Du, K., Liao, Y., Zhang, J., Quade, M., Loosen, P., ...
A laser system effects frequency doubling by means of a laser medium within a resonator, the maximum achievable efficiency for stable laser operation being determined by the maximum achievable...
Gain at the end configuration of a diode-pumped, Kerr-lens mode-locked Cr:LiSGaF laser (1998)
Rußbüldt, P., Gäbel, K., Du, K., Lebert, R., Loosen, P., Poprawe, R., ...
Fulltext: Currently the widespread application of fs-lasers is limited by price and complexity. One approach for userfriendly systems are diode-pumped Kerr-lens mode-locked (KLM) fs-lasers with...
The appts. includes one or more solid-state and/or semiconductor lasers (1) and several corresponding refractive elements (5). The lasers are in the form of an array and the refractive elements act...
38W Nd:YAG slab laser partially end pumped by a stack with 3 diode laser bars (1998)
Wu, N., Xu, J., Giesekus, J., Liao, Y., Du, K., Loosen, P., ...
Fulltext: To scale the output power of diode pumped solid state lasers at high beam quality, high efficiency and low cost, we have developed a novel slab laser concept, which consists of slab-shaped...
Stability of lasers with intracavity second order nonlinearity (1997)
Falter, S., Du, K., Liao, Y., Quade, M., Zhang, J., Loosen, P., ...
On the basis of the dynamical model for the intracavity frequency-doubled laser we demonstrate a criterion for the stable operation of laser-resonators with intracavity nonlinear elements. This...
Seitlich- oder endgepumpt. Neue Entwicklungen bei diodengepumpten Festkörperlasern (1997)
Diode pumped solid-state lasers with wattage outputs well into double figures, yet only the size of a shoe-box, have already found applications in printing, medical and measuring technologies,...
Polarization characteristics of a Nd:YAG laser side pumped by diode laser bars (1997)
Zhang, J., Quade, M., Liao, Y., Falter, S., Du, K., Loosen, P.
A detailed experimental investigation of the polarization characteristics of a diode laser side-pumped Nd:YAG laser has been performed. A Brewster plate inserted into the cavity resulted in a...
Parallel diode-pumped frequency doubled Nd:YAG laser (1997)
Quade, M., Du, K., Falter, S., Zhang, J., Loosen, P., Poprawe, R., ...
Nonlinear optical devices, such as harmonic generators, provide a means of extending the frequency range of available laser sources. In this paper we report on a novel concept for scaling the output...
The arrangement has at least one prism in the optical path to enable the relative orientation of the image plane or the object plane to the optical axis to be changed. The arrangement forms images of...
New concepts for compact diode-pumped fs-lasers (1997)
Gäbel, K., Rußbüldt, P., Rotarius, G., Bette, B., Lebert, R., Du, K., ...
We report the successful implementation of Gires-Tournois(GTI) and chirped mirrors in a diode-pumped, Kerr-lens modelocked (KLM) Cr:LiSGaF laser. The laser delivered 30mW of 79fs nearly transform...
Nd:YAG slab laser partially end-pumped by diode laser stack (1997)
Liao, Y., Du, K., Falter, S., Zhang, J., Quade, M., Loosen, P., ...
An efficient high power cw Nd:YAG slab laser, partially end pumped by diode laser stacks is described in this paper. With conventional stable resonator, the optical efficiency amounted to 44 per cent...
Nd:YAG slab laser end-pumped by laser-diode stacks and its beam shaping (1997)
An efficient high power cw Nd:YAG slab laser, partially end-pumped by diode laser stacks, and a novel beam shaping technique are reported in this paper. The optical efficiency amounted to 44 per cent...
Laserresonator für Laser-Medien mit ringförmigem Querschnitt (1997)
Habich, U., Du, K., Bauer, A., Plum, H.D., Loosen, P.
The description refers to a laser resonator for the utilization of media having an annular-shaped cross-section and two end mirrors. The invention is characterized by the end mirrors having a...
Highly efficient diode-stack, end-pumped Nd:YAG slab laser with symmetrized beam quality (1997)
Liao, Y., Du, K., Falter, S., Zhang, J., Quade, M., Loosen, P., ...
An efficient high-power cw Nd:YAG slab laser, partially end pumped by diode-laser stacks, and a novel beam-shaping technique are reported. The optical efficiency amounted to 44 per cent, and the...
Fiber-coupling technique with micro step-mirrors for high-power diode laser bars (1997)
Du, K., Baumann, M., Ehlers, B., Treusch, H.G., Loosen, P.
A technique for coupling the output of a high-power diode laser bar into one multimode fiber with high efficiency, easy alignment requirements and low manufacturing costs is demonstrated using a...
Efficient TEM(00) operation of Nd:YVO4 laser end pumped by fibre-coupled diode laser (1997)
Zhang, J., Quade, M., Du, K., Liao, Y., Falter, S., Baumann, M., ...
We have demonstrated efficient TEM00 operation of the Nd:YVO4 rod laser, one-end-pumped by a fibre-coupled diode laser. 11.6-W linearly polarized laser output with an optical efficiency of 54 per...
Efficient TEM(00) operation of Nd:YVO4 laser end pumped by fibre-coupled diode laser (1997)
Zhang, J., Quade, M., Du, K., Liao, Y., Falter, S., Baumann, M., ...
The authors have demonstrated efficient TEM(00)operation of the Nd:YVO4 rod laser, one-end-pumped by a one-fibre-coupled diode laser. A 11.6W linearly polarised laser output with an optical...
Dynamics and stability of a laser system with second-order nonlinearity (1997)
Falter, S., Du, K., Liao, Y., Quade, M., Zhang, J., Loosen, P., ...
We use a multimode rate-equation model to investigate the stability of a laser system with second-order nonlinearity and compare the results with the literature on intracavity frequency-doubled...
Compact fibre-coupled high-power diode-laser unit (1997)
Baumann, M., Ehlers, B., Quade, M., Du, K., Loosen, P., Poprawe, R., ...
We developed a compact fibre-coupled high-power diode-laser unit with optical output power up to 40 W cw, coupled into a multimode fibre with 600 mu m core diameter and NA 0.22. This diode-laser unit...
Beam shaping and fibre coupling of high-power diode laser arrays (1997)
Du, K., Baumann, M., Loosen, P., Poprawe, R., Treusch, H.G.
A technique for coupling the radiation of a high-power diode laser bar into one multimode fibre with high efficiency, easy alignment requirements and low manufacturing costs is demonstrated using a...
Du, K., Ehrlichmann, D., Habich, U., Loosen, P.
The device includes a reflection block (8) onto which the outputs (7) of an array of gas laser elements (1) are incident parallel to each other. The laser outputs, separated into at least two parts,...