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Spectroscopic detection of hazardous substances using broadband-tunable quantum cascade lasers

: Hugger, S.; Fuchs, F.; Jarvis, J.; Yang, Q.K.; Driad, R.; Bronner, W.; Aidam, R.; Ostendorf, R.; Wagner, J.


Optical Society of America -OSA-, Washington/D.C.:
Optical Sensors : Part of Advanced photonics ; 27 - 31 July 2014, Barcelona, Spain
Washington, DC: OSA, 2014 (OSA Technical digest series)
ISBN: 978-1-55752-820-9
Paper SeTh3B.1
Conference "Optical Sensors" <2014, Barcelona>
Conference Paper
Fraunhofer IAF ()

Broadband tunable external cavity quantum cascade lasers (EC-QCL) [1] are very attractive light sources for mid-infrared (MIR) spectroscopy. Here we report on EC-QCL based spectroscopic detection of hazardous substances, focusing on two application examples: Stand-off detection of explosives and sensing of dangerous contaminations in water. Our standoff-system provides contactless identification of solid residues of different explosives over distances of several meters. In our setup for MIR absorption spectroscopy on liquids, the EC-QCL enables the use of a transmission cell with an extended optical path length of 100 m despite the strong background absorption of water.