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Infrared semiconductor lasers for DIRCM applications

Infrarot-Halbleiterlaserfür DIRCM Anwendungen
: Wagner, J.; Schulz, N.; Rösener, B.; Rattunde, M.; Yang, Q.; Fuchs, F.; Manz, C.; Bronner, W.; Mann, C.; Köhler, K.; Raab, M.; Romasev, E.; Tholl, H.D.


Titterton, D.H. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Europe, Cardiff:
Technologies for optical countermeasures V : 15 - 16 September 2008, Cardiff, Wales, United Kingdom
Bellingham, WA: SPIE, 2008 (Proceedings of SPIE 7115)
ISBN: 978-0-8194-7347-9
ISSN: 0277-786X
Paper 71150A
Conference "Technologies for Optical Countermeasures" <5, 2008, Cardiff>
Fraunhofer IAF ()
infrared; Infrarot; semiconductor laser; Halbleiterlaser; optically pumped semiconductor disk laser; OPSDL; optisch gepumpte Halbleiter-Laserscheiben; vertical-external-cavity surface-emitting laser; VECSEL; power scaling; laser beam coupling; directed infrared countermeasures; DIRCM

We report on the development and characteristics of infrared semiconductor lasers as compact and robust light sources for Directed Infrared Countermeasures (DIRCM). The short-wavelength side of the 2-5 µm wavelength band of interest can be covered by GaSb-based optically pumped semiconductor disk lasers (OPSDLs), delivering a continuous-wave (cw) or temporally modulated multiple-Watt output with a high beam quality (M2<3). For the 3.7-5 µm wavelength range InP-based quantum cascade (QC) lasers are the best suited semiconductor laser source, delivering several hundreds of mW of average output power in a nearly diffraction limited output beam (M2<2). Further up-scaling of the output power can be achieved for OPSDLs by intra-cavity coupling of several semiconductor chips as gain elements in a multiple-disk cavity arrangement. For a 2.3 m emitting dual-disk OPSDL, a doubling of the maximum roomtemperature output power compared to that of a comparable single-chip OPSDL has been demonstrated. For QC lasers power scaling by beam-quality-preserving beam combining has been demonstrated via polarization coupling of the output beams of two individual QC lasers, yielding a coupling efficiency of 82%.