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Title of Journal: Appl Phys B

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Abbravation: Applied Physics B

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Springer-Verlag

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DOI

10.1002/jctb.5000425217

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1432-0649

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Timeresolved spectral characteristics of external

Authors: B Hinkov F Fuchs Q K Yang J M Kaster W Bronner R Aidam K Köhler J Wagner
Publish Date: 2010/01/14
Volume: 100, Issue: 2, Pages: 253-260
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Abstract

We present the timeresolved spectral analysis of the settling process in a pulsed externalcavity quantumcascade laser ECQC laser emitting in the wavelength range around 74 μm Due to mode competition between the two cavities formed by the laserchip on one hand and the externalcavity on the other hand a timedependent spectral emission on a ns timescale can be observed Depending on the spectral characteristic of the external cavity with respect to the chip gain curve timedelays of the external cavity emission of 15–35 ns within the 100 ns drive pulse can be observedRegarding the application we discuss the results in the context of using the ECQC laser system together with a highperformance IRcamera for standoff detection of surfacecontaminations with explosives such as TNT The detected densities can be as small as 10 μg/cm2 corresponding to traces left by a fingerprint

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  14. Study of the optical bistability in the laser oscillation of Yb:GdVO 4 crystal
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