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Broadband-tunable external-cavity quantum cascade lasers for the spectroscopic detection of hazarduos substances

: Hugger, S.; Fuchs, F.; Jarvis, J.P.; Kinzer, M.; Yang, Q.K.; Driad, R.; Aidam, R.; Wagner, J.


Razeghi, M. (ed) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Quantum Sensing and Nanophotonic Devices X : January 2013, San Francisco/Calif
Bellingham, WA: SPIE, 2013 (Proceedings of SPIE 8631)
ISBN: 978-0-8194-9400-9
Paper 86312I
Conference "Quantum Sensing and Nanophotonic Devices" <10, 2013, San Francisco/Calif.>
Fraunhofer IAF ()

Broadband tunable external cavity quantum cascade lasers (EC-QCL) have emerged as attractive light sources for midinfrared (MIR) "finger print" molecular spectroscopy for detection and identification of chemical compounds. Here we report on the use of EC-QCL for the spectroscopic detection of hazardous substances, using stand-off detection of explosives and sensing of hazardous substances in water as two prototypical examples. Our standoff-system allows the contactless identification of solid residues of various common explosives over distances of several meters. Furthermore, results on an EC-QCL-based setup for MIR absorption spectroscopy on liquids are presented, featuring a by a factor of ten larger single-pass optical path length of 100 µm as compared to conventional Fourier transform infrared spectroscopy instrumentations.