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Proceedings Paper

Sensitivity of long-wave infrared intracavity laser absorption vapor detector
Author(s): Gautam Medhi; Chris J. Fredricksen; Robert E. Peale; Andrey V. Muravjov; Oliver J. Edwards
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Paper Abstract

A quantum cascade laser at IR wavelengths with an open external cavity presents an opportunity for spectral sensing of molecular compounds that have low vapor pressure. The sensitivity of such a system is potentially very high due to extraordinarily long effective optical paths that can be achieved in an active cavity. We demonstrate here an external cavity mid-IR QCL molecular absorption sensor using a fixed Fabry-Perot etalon as the spectrum analyzer. The system is sensitive to the water vapor present in the laboratory air with an absorption coefficient of just 9.6 x 10-8 cm-1. The system is sensitive enough to detect the absorption coefficient of TNT vapor at room temperature.

Paper Details

Date Published: 6 February 2012
PDF: 8 pages
Proc. SPIE 8236, Laser Resonators, Microresonators, and Beam Control XIV, 82361J (6 February 2012); doi: 10.1117/12.909205
Show Author Affiliations
Gautam Medhi, Univ. of Central Florida (United States)
Chris J. Fredricksen, Univ. of Central Florida (United States)
Robert E. Peale, Univ. of Central Florida (United States)
Andrey V. Muravjov, Zyberwear, Inc. (United States)
Oliver J. Edwards, Zyberwear, Inc. (United States)

Published in SPIE Proceedings Vol. 8236:
Laser Resonators, Microresonators, and Beam Control XIV
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko, Editor(s)

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