R. B. Kearfott, M. Dawande, K. Du
INTLIB is meant to be a readily available, portable, exhaustively documented interval arithmetic library, written in standard FORTRAN 77. Its underlying philosophy is to provide a standard for...
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,...
Expression analysis and chromosomal assignment of the human SFRS5/SRp40 gene (1997)
Snow, BE, Heng, HHQ, Shi, X-M, Zhou, Y, Du, K, Taub, R, ...
Alternative splicing plays a major role in the regulation of gene expression. SFRS5/SRp40 is a member of the serine/arginine (SR) protein family of regulators of alternative pre-mRNA splicing. We...
Laser resonators with at least two resonator mirrors bordering on the resonator are known, in the ray path of which an active laser medium emitting a radiation and at least a folding element...
The solid state laser has a solid state material for generating a laser beam and associated pump source. The pump radiation is beamed into the solid state material and the arising heat conducted...
Diodenlasergepumpter Festkoerperlaser (1996)
The laser has a rod- or disc-shaped solid body (9) as the active laser medium, receiving the pumping radiation (11) from laser diodes (10) positioned at spaced points around it. The solid body is...
Design and industrial applications of high-power diode-lasers (1996)
Loosen, P., Biesenbach, J., Du, K., Haas, C.R., Poprawe, R., Treusch, H.G.
Developments concerning high-power diode lasers, optical systems for beam shaping and superposition and complete systems for direct materials processing will be discussed, along with examples of...
Du, K., Loosen, P., Maerten, O., Linzenich, B.
The invention relates to a process and a device for adjusting beam guidance and shaping and for aligning optical systems, in particular in laser systems. In the processor according to the invention,...
Measurement of statistical phase distortions of active medium (1995)
Du, K., Niehoff, J., Stewen, C., Loosen, P.
The trend of development in fast axial flow CO2 lasers with transversal RF excitation leads to increasing laser power with high beam quality. Since the power density of the discharge is limited due...
Lasers for materials processing: specification and trends (1995)
Du, K., Biesenbach, J., Ehrlichmann, D., Habich, U., Jarosch, U., Klein, J., ...
An overview is given of the types of lasers dominating the field of laser materials processing. The most prominent lasers in this field are the C02 and the Nd:YAG laser. The domain Of C02 lasers is...
Laserresonator mit ringförmigem Querschnitt (1995)
Du, K., Loosen, P., Habich, U.
Beschrieben wird ein Laserresonator mit zwei einander zugewendeten Spiegeln und mit einer Strahlauskoppelstelle. Erfindungsgemäß ist die Spiegelfläche wenigstens eines Spiegels derart ausgebildet,...
Development of an industrial CO2 laser with more than 40 kW output power. Recent results (1995)
Habich, U., Du, K., Ehrlichmann, D., Jarosch, U., Niehoff, J., ...
Results of power scaling experiments on high power CO2 lasers for industrial applications are given. RF-excited systems with fast axial gas flow (FAF) and fast gas flow in an annular discharge gap...
Properties of a high-power CO2-laser with an adaptive mirror (1994)
A high-power C02 laser was supplied with an adaptive rear mirror, whose radius of curvature can be changed by adjusting the pressure of the cooling medium. Investigations concerning the beam quality...
Laserresonator, insbesondere fuer Kohlendioxidlaser, mit zwei Resonator-Endspiegeln, die aktives Material zwischen zwei vollreflektierenden Endspiegelflaechen aufweisen, welche einen instabilen...
Influences of statistical phase distortions of active medium on laser performances (1993)
Experimental results obtained with a high-power CO2 laser show that depending on the gas flowing state beam quality and output power of a gas laser can be strongly impacted by statistical phase...
Franek, J., Pflüger, S., Imhoff, R., Du, K.
Zum Vergleich der Schweißeigenschaften von stabilen und instabilen Resonatoren wurde ein industrieller COtief2-Laser mit achsialer Gasströmung mit zwei stabilen und einem instabilen Resonator bei...
Optical quality of a combined aerodynamic window (1991)
Franek, J., Zefferer, H., Du, K.
The novel aerodynamic window with a pump cavity and a supersonic gas jet described in /1/ shows considerable improvements in operation performances such as shock-free operation range, reduction of...
Du, K., Loosen, P., Herziger, G.
Laser, consisting of a beam path multiple-folded by means of two cavity end mirrors and having at least one reflector folding the laser beam retroreflectively, the axis of which is arranged offset in...
Comparison of welding results with stable and unstable resonators (1991)
Franke, J., Pflüger, S., Du, K., Imhoff, R.
In order to compare welding performance of stable and unstable resonators an industrial axial-flow-CO2-laser in the 5 kW range has been operated with two stable and one unstable resonator at 5 kW....
Novel aerodynamic window with a pump cavity and a supersonicjet (1990)
In order to minimize the mass flow rate and the optical distortion of aerodynamic windows, a novel type with a pump cavity and a supersonic gas jet has been developed. Prototypes of this window with...
Investigation of the spatial homogenity of high frequency excited laser discharges. (1990)
Schwede, H., Franek, J., Märten, O., Du, K., Wagner, R.
The intensity distribution of a laser beam is determined by resonator geometry as well as the characteristics of the active medium. The influence of the active medium on the intensity distribution...
Influence of gain distribution on the properties of unstable resonators. (1990)
It was first pointed out by Siegman (1) that the advantageous properties of unstable optical resonators include excellent transverse mode discrimination, large mode volumina, high beam quality and...
AERODYNAMISCHES FENSTER FUER EINEN GASLASER (1990)
Du, K., Franek, J., Loosen, P.
Aerodynamisches Fenster fuer einen Gaslaser, dessen aktive Kammer einen fokussierten Laserstrahl abgibt und mittels einer Strahldurchtrittsoeffnung mit einer an einer Vakuumpumpe angeschlossenen...
Influence of laser-target interaction of the polarization of a CO2-laser (1989)
Seelig, W., Du, K., Herziger, G.
Laser materials processing shows a special pecularity compared to other customary techniques: the (generally reflecting) target introduces optical feedback into the system. This feedback changes the...
GENERATION AND QUENCHING OF NF(a) AND NF(b) MOLECULES (1987)
Setser, D., Cha, H., QuiÑones, E., Du, K.
The Ar(3P0, 2) + NF2 and 2F + HN3 reactions have been developed as sources of NF(b1Σ+) and NF(a1Ɗ) molecules, respectively, in a flow reactor. The decay kinetics for these molecules in the...
Untersuchung der Fokussierung von Laserstrahlung mit Off-Axis Parabol-Spiegeln (1987)
Bei der Materialbearbeitung mit Laserstrahlung spielen die Laserparameter wie z.B. Leistung, Fokussierbarkeit, Pulsform und Polarisationszustand eine entscheidende Rolle fuer das...
GENERATION AND QUENCHING OF NF(a) AND NF(b) MOLECULES (1987)
Setser, D., Cha, H., QuiÑones, E., Du, K.
The Ar(3P0, 2) + NF2 and 2F + HN3 reactions have been developed as sources of NF(b1Σ+) and NF(a1Ɗ) molecules, respectively, in a flow reactor. The decay kinetics for these molecules in the...
GENERATION AND QUENCHING OF NF(a) AND NF(b) MOLECULES (1987)
Setser, D., Cha, H., QuiÑones, E., Du, K.
The Ar(3P0, 2) + NF2 and 2F + HN3 reactions have been developed as sources of NF(b1Σ+) and NF(a1Ɗ) molecules, respectively, in a flow reactor. The decay kinetics for these molecules in the...
Du, K, Peng, Y, Greenbaum, L E, Haber, B A, Taub, R
Serine-arginine (SR)-rich proteins are believed to be important in mediating alternative pre-mRNA splicing. HRS/SRp40 expression is elevated in liver cell proliferation during development,...
Du, K, Peng, Y, Greenbaum, L E, Haber, B A, Taub, R
Serine-arginine (SR)-rich proteins are believed to be important in mediating alternative pre-mRNA splicing. HRS/SRp40 expression is elevated in liver cell proliferation during development,...
INTLIB: A Portable FORTRAN 77 Interval Standard Function Library
R.B. Kearfott, M. Dawande, K. Du, Ch. Hu
INTLIB is meant to be a readily available, portable, exhaustively documented interval arithmetic library, written in standard FORTRAN 77. Its underlying philosophy is to provide a standard for...