29 May 2014 Active FTIR-based standoff detection in the 3-4 micron region using broadband femtosecond optical parametric oscillators
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Abstract
We present the first demonstration of stand-off Fourier transform infrared spectroscopy using a broadband mid-infrared femtosecond optical parametric oscillator, with spectral coverage over 2700–3200 cm-1. Remote spectroscopy and chemical detection from 2700–3100 cm-1 is demonstrated for a thiodiglycol drop on concrete and anodized aluminum surfaces at a stand-off distance of 2 meters, as well as open-path spectroscopy of atmospheric water vapor from a concrete target at the same range. Comparison of the measured stand-off spectra with archived reference spectra for thiodiglycol and water vapor show good agreement. This technique provides greater spatial coherence and spectral brightness than a thermal source, and wider spectral coverage than a typical quantum-cascade laser, thereby presenting opportunities for application in the detection of industrial pollutants and the environmental identification of chemical warfare agents, explosives or other hazardous materials.
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Derryck T. Reid, Zhaowei Zhang, Christopher R. Howle, "Active FTIR-based standoff detection in the 3-4 micron region using broadband femtosecond optical parametric oscillators", Proc. SPIE 9073, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV, 907302 (29 May 2014); doi: 10.1117/12.2053227; https://doi.org/10.1117/12.2053227
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