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Proceedings Paper

Infrared intracavity laser absorption spectrometer
Author(s): G. Medhi; A. V. Muravjov; H. Saxena; J. W. Cleary; C. J Fredricksen; R. E. Peale; O. Edwards
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Paper Abstract

A spectral sensing method with sufficient sensitivity to detect vapors of low vapor-pressure compounds such as explosives would have great promise for defense and security applications. An opportunity is Intracavity Laser Absorption Spectroscopy (ICLAS) at IR wavelengths. Our approach is based on multi-mode external-cavity quantum cascade lasers and a scanning Fabry-Perot spectrometer to analyze the laser mode spectrum in the presence of a narrow band intracavity absorber. This paper presents results of numerical solution of laser rate equations that support feasibility of kilometer effective active-cavity path lengths and sensitivity to concentrations of 10 ppb. This is comparable to the saturated vapor pressure of TNT. System design considerations and first experimental results are presented at 10 and 70 μm wavelengths.

Paper Details

Date Published: 21 April 2010
PDF: 8 pages
Proc. SPIE 7680, Next-Generation Spectroscopic Technologies III, 76800N (21 April 2010); doi: 10.1117/12.852585
Show Author Affiliations
G. Medhi, Univ. of Central Florida (United States)
A. V. Muravjov, Zyberwear, Inc. (United States)
H. Saxena, Univ. of Central Florida (United States)
J. W. Cleary, Univ. of Central Florida (United States)
C. J Fredricksen, Univ. of Central Florida (United States)
R. E. Peale, Univ. of Central Florida (United States)
O. Edwards, Zyberwear, Inc. (United States)

Published in SPIE Proceedings Vol. 7680:
Next-Generation Spectroscopic Technologies III
Mark A. Druy; Christopher D. Brown; Richard A. Crocombe, Editor(s)

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