970-nm ridge waveguide diode laser bars for high power DWBC systems

Martin Wilkens; Götz Erbert; Hans Wenzel; Andrea Knigge; Paul Crump; Andre Maaßdorf; Jörg Fricke; Peter Ressel; Stephan Strohmaier; Berthold Schmidt; Günther Tränkle

doi:10.1117/12.2289870

19 February 2018 970-nm ridge waveguide diode laser bars for high power DWBC systems

Martin Wilkens, Götz Erbert, Hans Wenzel, Andrea Knigge, Paul Crump, Andre Maaßdorf, Jörg Fricke, Peter Ressel, Stephan Strohmaier, Berthold Schmidt, Günther Tränkle

Author Affiliations +

Proceedings Volume 10514, High-Power Diode Laser Technology XVI; 105140E (2018) https://doi.org/10.1117/12.2289870
Event: SPIE LASE, 2018, San Francisco, California, United States

Abstract

de lasers are key components in material processing laser systems. While mostly used as pump sources for solid state or fiber lasers, direct diode laser systems using dense wavelength multiplexing have come on the market in recent years. These systems are realized with broad area lasers typically, resulting in beam quality inferior to disk or fiber lasers. We will present recent results of highly efficient ridge waveguide (RW) lasers, developed for dense-wavelength-beamcombining (DWBC) laser systems expecting beam qualities comparable to solid state laser systems and higher power conversion efficiencies (PCE).

The newly developed RW lasers are based on vertical structures with an extreme double asymmetric large optical cavity. Besides a low vertical divergence these structures are suitable for RW-lasers with (10 μm) broad ridges, emitting in a single mode with a good beam quality. The large stripe width enables a lateral divergence below 10° (95 % power content) and a high PCE by a comparably low series resistance. We present results of single emitters and small test arrays under different external feedback conditions. Single emitters can be tuned from 950 nm to 975 nm and reach 1 W optical power with more than 55 % PCE and a beam quality of M² < 2 over the full wavelength range. The spectral width is below 30 pm FWHM. 5 emitter arrays were stabilized using the same setup. Up to now we reached 3 W optical power, limited by power supply, with 5 narrow spectral lines.

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Martin Wilkens, Götz Erbert, Hans Wenzel, Andrea Knigge, Paul Crump, Andre Maaßdorf, Jörg Fricke, Peter Ressel, Stephan Strohmaier, Berthold Schmidt, and Günther Tränkle "970-nm ridge waveguide diode laser bars for high power DWBC systems", Proc. SPIE 10514, High-Power Diode Laser Technology XVI, 105140E (19 February 2018); https://doi.org/10.1117/12.2289870

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