Active FTIR-based standoff detection in the 3-4 micron region using broadband femtosecond optical parametric oscillators

Derryck T. Reid; Zhaowei Zhang; Christopher R. Howle

doi:10.1117/12.2053227

29 May 2014 Active FTIR-based standoff detection in the 3-4 micron region using broadband femtosecond optical parametric oscillators

Derryck T. Reid, Zhaowei Zhang, Christopher R. Howle

Author Affiliations +

Proceedings Volume 9073, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV; 907302 (2014) https://doi.org/10.1117/12.2053227
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

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.

Citation Download Citation

Derryck T. Reid, Zhaowei Zhang, and 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); https://doi.org/10.1117/12.2053227

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