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Proceedings Paper

Diode laser modules of highest brilliance for materials processing
Author(s): Alexander Knitsch; Axel Luft; Tobias Gross; Detlev Ristau; Peter Loosen; Reinhart Poprawe
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Paper Abstract

Beam quality and output power of mostly 2-dimensional stacked diode laser systems are insufficient for the demands of materials processing. To increase the output power at almost constant beam-quality, superimposition of diode laser bars of different wavelengths as well as polarization-multiplexing of s- and p-polarized laser beams is possible. Different techniques for wavelength-multiplexing have been developed. The so-called multi-filter concept of a spanned coated etalon with edge-filters has turned out best. The concept features a modular design, simple adjustment and easy add-on of more wavelengths. Concerning the polarization-multiplexing we take advantage of the almost linear polarized diode laser bars. Ordinary used beam splitter cubes with a cemented structure are less qualified for high radiance. Hence the beam combination is achieved with beam displacers made of a birefringent crystal (YVO4) which provide high transmittance and convenient adaptation. Finally an experimental set-up with 8 diode laser bars of 4 different wavelengths, i.e. 8-times beam superimposition, is realized. The set-up called multiplexer obtains a radiance of about 4 x 106 W cm-2 sr-1 and outnumbers all other comparable high power diode laser systems.

Paper Details

Date Published: 22 May 2002
PDF: 8 pages
Proc. SPIE 4651, Novel In-Plane Semiconductor Lasers, (22 May 2002); doi: 10.1117/12.467954
Show Author Affiliations
Alexander Knitsch, Fraunhofer-Institut fuer Lasertechnik (Germany)
Axel Luft, ThyssenKrupp Nothelfer GmbH (Germany)
Tobias Gross, Laser Zentrum Hannover e.V. (Germany)
Detlev Ristau, Laser Zentrum Hannover e.V. (Germany)
Peter Loosen, Fraunhofer-Institut fuer Lasertechnik (Germany)
Reinhart Poprawe, Fraunhofer-Institut fuer Lasertechnik (Germany)

Published in SPIE Proceedings Vol. 4651:
Novel In-Plane Semiconductor Lasers
Jerry R. Meyer; Claire F. Gmachl, Editor(s)

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