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Widely tuneable quantum cascade lasers for spectroscopic sensing

 
: Wagner, J.; Ostendorf, R.; Grahmann, Jan; Merten, André; Hugger, S.; Jarvis, J.P.; Fuchs, F.; Boskovic, D.; Schenk, Harald

:

Razeghi, M. (Ed.); Tournie, E. (Ed.); Brown, G. J. (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Quantum Sensing and Nanophotonic Devices XII. Proceedings : 8–12 February 2015, San Francisco, California, United States
Bellingham, WA: SPIE, 2015 (Proceedings of SPIE 9370)
ISBN: 978-1-62841-460-8
Paper 937012, 6 S.
Conference "Quantum Sensing and Nanophotonic Devices" <12, 2015, San Francisco/Calif.>
Englisch
Konferenzbeitrag
Fraunhofer IAF ()
Fraunhofer IPMS ()
Fraunhofer ICT ()
tunable infrared laser; quantum cascade laser; external cavity laser; standoff detection; active hyperspectral imaging; spectroscopic process analysis

Abstract
In this paper recent advances in broadband-tuneable mid-infrared (MIR) external-cavity quantum cascade lasers (EC-QCL) technology are reported as well as their use in spectroscopic process analysis and imaging stand-off detection of hazardous substances, such as explosive and related precursors. First results are presented on rapid scan EC-QCL, employing a custom-made MOEMS scanning grating in Littrow-configuration as wavelength-selective optical feedback element. This way, a scanning rate of 1 kHz was achieved, which corresponds to 2000 full wavelength scans per second. Furthermore, exemplary case studies of EC-QCL based MIR spectroscopy will be presented. These include time resolved analysis of catalytic reactions in chemical process control, as well as imaging backscattering spectroscopy for the detection of residues of explosives and related precursors in a relevant environment.

: http://publica.fraunhofer.de/dokumente/N-328177.html