12.2 W output power from 1060 nm DBR tapered lasers with narrow spectral line width and nearly diffraction limited beam quality
B. Sumpf, K.-H. Hasler, P. Adamiec, F. Bugge, J. Fricke, H. Wenzel, G. Erbert, G. Tränkle
Published in:
European Conf. on Lasers and Electro-Optics and the European Quantum Electronics Conf. (CLEO Europe - EQEC 2009), Munich, Germany, Jun. 14-19, paper CB-12.3-THU (2009).
Abstract:
In this contribution two-sectional Distributed Bragg Reflector (DBR) tapered lasers with a 6th order surface grating are presented. They emit with a maximal cw output power of 12.2 W at a wavelength of 1060 nm and a temperature of 25degC. The devices have a total cavity length of 6 mm. The ridge waveguide (RW) and the tapered sections with lengths of 2 mm and 4 mm, respectively, have electrically separated contacts which allow a direct modulation of the output power by a variation of the RW current only. The passive DBR mirrors with a length of 1 mm are located at the rear side of the lasers. Due to the resolution limit of the wafer stepper of 0.4 mum, a 6th order Bragg grating with a period of about 1 mum has been employed. A reflectivity of about 60% was obtained by a careful design of the length of the un-etched region within a grating period.
Ferdinand-Braun-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany
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