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Proceedings Paper

Stabilizing infrared quantum cascade laser beams for standoff detection applications
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Paper Abstract

We are developing a technology for standoff detection of chemicals on surfaces based on active broadband infrared imaging spectroscopy. This approach leverages one or more IR quantum cascade lasers (QCL), tuned to strong absorption bands in the analytes and directed to illuminate an area on a surface of interest. An IR focal plane array is used to image the surface response upon laser illumination. The broadband IR signal is processed as a hyperspectral image cube comprised of spatial, spectral and temporal dimensions as vectors within a detection algorithm. Such standoff spectroscopic imaging applications place stringent stability requirements on the wavelength, power, pulse width and spatial beam profile that pose a challenge for broadly tunable IR QCL. In this manuscript, we discuss methods to mitigate these challenges, including extensive calibration and active feedback stabilization. These mitigation methods should benefit many applications of IR QCL, including those for standoff detection, spectroscopy and imaging.

Paper Details

Date Published: 27 January 2017
PDF: 9 pages
Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 101110B (27 January 2017); doi: 10.1117/12.2251592
Show Author Affiliations
Christopher J. Breshike, U.S. Naval Research Lab. (United States)
Christopher A. Kendziora, U.S. Naval Research Lab. (United States)
Robert Furstenberg, U.S. Naval Research Lab. (United States)
Viet Nguyen, U.S. Naval Research Lab. (United States)
R. Andrew McGill, U.S. Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 10111:
Quantum Sensing and Nano Electronics and Photonics XIV
Manijeh Razeghi, Editor(s)

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