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Applied Physics B

, Volume 100, Issue 2, pp 253–260 | Cite as

Time-resolved spectral characteristics of external-cavity quantum cascade lasers and their application to stand-off detection of explosives

  • B. HinkovEmail author
  • F. Fuchs
  • Q. K. Yang
  • J. M. Kaster
  • W. Bronner
  • R. Aidam
  • K. Köhler
  • J. Wagner
Article

Abstract

We present the time-resolved spectral analysis of the settling process in a pulsed external-cavity quantum-cascade laser (EC-QC laser) emitting in the wavelength range around 7.4 μm. Due to mode competition between the two cavities formed by the laser-chip on one hand and the external-cavity on the other hand, a time-dependent spectral emission on a ns time-scale can be observed. Depending on the spectral characteristic of the external cavity with respect to the chip gain curve time-delays of the external cavity emission of 15–35 ns within the 100 ns drive pulse can be observed.

Regarding the application, we discuss the results in the context of using the EC-QC laser system together with a high-performance IR-camera for stand-off detection of surface-contaminations with explosives such as TNT. The detected densities can be as small as 10 μg/cm2 corresponding to traces left by a fingerprint.

Keywords

Quantum Cascade Laser Internal Cavity External Cavity Laser Speckle External Cavity Quantum Cascade Laser 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • B. Hinkov
    • 1
    Email author
  • F. Fuchs
    • 1
  • Q. K. Yang
    • 1
  • J. M. Kaster
    • 1
  • W. Bronner
    • 1
  • R. Aidam
    • 1
  • K. Köhler
    • 1
  • J. Wagner
    • 1
  1. 1.Fraunhofer Institute for Applied Solid State Physics (IAF)FreiburgGermany

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