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  4. Widely tuneable quantum cascade lasers for spectroscopic sensing
 
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2015
Conference Paper
Title

Widely tuneable quantum cascade lasers for spectroscopic sensing

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.
Author(s)
Wagner, J.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Ostendorf, R.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Grahmann, Jan  
Fraunhofer-Institut für Photonische Mikrosysteme IPMS  
Merten, André  
Fraunhofer-Institut für Photonische Mikrosysteme IPMS  
Hugger, S.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Jarvis, J.P.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Fuchs, F.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Boskovic, D.
Fraunhofer-Institut für Chemische Technologie ICT  
Schenk, Harald  
Fraunhofer-Institut für Photonische Mikrosysteme IPMS  
Mainwork
Quantum Sensing and Nanophotonic Devices XII. Proceedings  
Conference
Conference "Quantum Sensing and Nanophotonic Devices" 2015  
DOI
10.1117/12.2082794
Language
English
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Fraunhofer-Institut für Chemische Technologie ICT  
Fraunhofer-Institut für Photonische Mikrosysteme IPMS  
Keyword(s)
  • tunable infrared laser

  • quantum cascade laser

  • external cavity laser

  • standoff detection

  • active hyperspectral imaging

  • spectroscopic process analysis

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