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Infrared semiconductor laser modules for DIRCM applications

: Wagner, J.; Hugger, S.; Rösener, B.; Fuchs, F.; Rattunde, M.; Yang, Q.K.; Bronner, W.; Aidam, R.; Köhler, K.; Raab, M.; Romasew, E.; Tholl, H.D.


Titterton, D.H. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Technologies for Optical Countermeasures VI : 31 August 2009, Berlin
Bellingham, WA: SPIE, 2009 (Proceedings of SPIE 7483)
ISBN: 978-0-8194-7789-7
Paper 74830F
Conference "Technologies for Optical Countermeasures" <6, 2009, Berlin>
Fraunhofer IAF ()
infrared semiconductor laser; infrared laser module; directed infrared countermeasure (DIRCM); quantum cascade laser; QC laser; optically pumped semiconductor disk laser; OPSDL; vertical-external-cavity surface-emitting laser; VECSEL; spectral beam combining

We report on the concept, realization and performance data of infrared semiconductor laser modules serving as compact and robust laser sources for a Directed Infrared Countermeasures (DIRCM) system. While the 2-2.5 µm atmospheric transmission window is covered by a GaSb-based optically pumped semiconductor disk laser (OPSDL), delivering a continuous-wave (cw) or temporally modulated output of => 1 W with a high beam quality (M2 < 3), an external cavity (EC) quantum cascade (QC) laser module is used to cover the 4.5-5 µm spectral range. The EC-QC laser concept allows efficient spectral beam combining of the output of several QC laser located side-by-side on the same semiconductor chip, while preserving the high-quality output beam of a single emitter. Both the OPSDL and the EC-QC laser have been integrated into rugged laser modules, comprising also all necessary power supply and control electronics, ready for use in field trials.