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Proceedings Paper

Infrared semiconductor lasers for DIRCM applications
Author(s): J. Wagner; N. Schulz; B. Rösener; M. Rattunde; Q. Yang; F. Fuchs; C. Manz; W. Bronner; C. Mann; K. Köhler; M. Raab; E. Romasev; H. D. Tholl
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Paper Abstract

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 µm 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%.

Paper Details

Date Published: 2 October 2008
PDF: 11 pages
Proc. SPIE 7115, Technologies for Optical Countermeasures V, 71150A (2 October 2008); doi: 10.1117/12.800126
Show Author Affiliations
J. Wagner, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
N. Schulz, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
B. Rösener, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
M. Rattunde, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Q. Yang, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
F. Fuchs, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
C. Manz, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
W. Bronner, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
C. Mann, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
K. Köhler, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
M. Raab, Diehl BGT Defence (Germany)
E. Romasev, Diehl BGT Defence (Germany)
H. D. Tholl, Diehl BGT Defence (Germany)


Published in SPIE Proceedings Vol. 7115:
Technologies for Optical Countermeasures V
David H. Titterton; Mark A. Richardson, Editor(s)

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