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.
ACCESS THE FULL ARTICLE
Martin Wilkens, Götz Erbert, Hans Wenzel, Andrea Knigge, Paul Crump, Andre Maaßdorf, Jörg Fricke, Peter Ressel, Stephan Strohmaier, Berthold Schmidt, 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);