Active FTIR-based stand-off spectroscopy using a femtosecond optical parametric oscillator

Zhaowei Zhang*, Rhea J. Clewes, Christopher R. Howle, Derryck T. Reid

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


We presented the first demonstration of stand-off Fourier transform infrared (FTIR) spectroscopy using a broadband mid-infrared optical parametric oscillator, with spectral coverage over 2700-3200 cm(-1). For vapor-phase water and nitromethane (NM), stand-off spectra was recorded using a concrete target at from 1-m to 2-m range and showed good agreement with reference spectra, and in NM a normalized detection sensitivity of 15 ppm . m . Hz(-1/2) was obtained. Spectra from 50-mu L droplets of liquid thiodiglycol were detected at a stand-off distance of 2 m from aluminum, concrete and painted metal surfaces. Our results imply that OPO-based active FTIR stand-off spectroscopy is a promising new technique for the detection of industrial pollutants and the identification of chemical agents, explosives or other hazardous materials. (C) 2014 Optical Society of America

Original languageEnglish
Pages (from-to)6005-6008
Number of pages4
JournalOptics Letters
Issue number20
Publication statusPublished - 15 Oct 2014




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