Diode laser modules of highest brilliance for materials processing

Alexander Knitsch; Axel Luft; Tobias Gross; Detlev Ristau; Peter Loosen; Reinhart Poprawe

doi:10.1117/12.467954

22 May 2002 Diode laser modules of highest brilliance for materials processing

Alexander Knitsch, Axel Luft, Tobias Gross, Detlev Ristau, Peter Loosen, Reinhart Poprawe

Proceedings Volume 4651, Novel In-Plane Semiconductor Lasers; (2002) https://doi.org/10.1117/12.467954
Event: Symposium on Integrated Optoelectronic Devices, 2002, San Jose, California, United States

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.

Citation Download Citation

Alexander Knitsch, Axel Luft, Tobias Gross, Detlev Ristau, Peter Loosen, and Reinhart Poprawe "Diode laser modules of highest brilliance for materials processing", Proc. SPIE 4651, Novel In-Plane Semiconductor Lasers, (22 May 2002); https://doi.org/10.1117/12.467954

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