High efficiency laser sources usable for single mode fiber coupling and frequency doubling

Patrick Friedmann; Jeanette Schleife; Jürgen Gilly; Márc T. Kelemen

doi:10.1117/12.907843

8 February 2012 High efficiency laser sources usable for single mode fiber coupling and frequency doubling

Patrick Friedmann, Jeanette Schleife, Jürgen Gilly, Márc T. Kelemen

Proceedings Volume 8277, Novel In-Plane Semiconductor Lasers XI; 82771M (2012) https://doi.org/10.1117/12.907843
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

Semiconductor laser diodes with a tapered gain region provide a beam quality near to the diffraction limit combined with high output power. They can be configured as lasers with a high-reflectivity coating on the rear facet and a high antireflection coating on the front facet. Additionally as amplifier with an antireflection coating on both facets they can be used in MOPA configuration together with a seed laser. Today amplifiers are commercially established with an optical output-power of 1-2W in a wide range of applications such as Raman spectroscopy or frequency doubling. With a new class of tapered lasers and amplifiers based on improved vertical and lateral designs, the output power for both types can be enlarged significantly. Taper design consists of an overall resonator length of 5mm and a taper angle of 4° providing a small lateral far-field angle <12° (95% power included). Tapered lasers emitting at 976nm have demonstrated 16W at 20A operation current with a wall-plug efficiency of 60% at 8.5W and 59% at 10W. Slope efficiency was 1.05W/A. These values are comparable to 100μm wide broad-area lasers with 5mm resonator length. The longterm stability has been tested by lifetime tests at 10W. The dependence of the beam quality on different parameters has been investigated especially for the high-current regime up to 15A. Whereas for lower power levels no changes have been found, slightly changes occurred at 10W after 1000 hours. Best beam quality was M2<1.8 at 8W for tapered lasers as well as for tapered amplifiers.

Citation Download Citation

Patrick Friedmann, Jeanette Schleife, Jürgen Gilly, and Márc T. Kelemen "High efficiency laser sources usable for single mode fiber coupling and frequency doubling", Proc. SPIE 8277, Novel In-Plane Semiconductor Lasers XI, 82771M (8 February 2012); https://doi.org/10.1117/12.907843

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