期刊
APPLIED OPTICS
卷 51, 期 15, 页码 2794-2807出版社
OPTICAL SOC AMER
DOI: 10.1364/AO.51.002794
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- Omni Sciences, Inc.
- U.S. Army Communications-Electronics Research, Development and Engineering Center (CERDEC) [W15P7T-10-C-H606]
- Defense Advanced Research Projects Agency (DARPA)
- Naval Air Systems Command (NAVAIR) [PMA-272]
We measure the diffuse reflection spectrum of solid samples such as explosives (TNT, RDX, PETN), fertilizers (ammonium nitrate, urea), and paints (automotive and military grade) at a stand-off distance of 5 m using a mid-infrared supercontinuum light source with 3.9 W average output power. The output spectrum extends from 750-4300 nm, and it is generated by nonlinear spectral broadening in a 9 m long fluoride fiber pumped by high peak power pulses from a dual-stage erbium-ytterbium fiber amplifier operating at 1543 nm. The samples are distinguished using unique spectral signatures that are attributed to the molecular vibrations of the constituents. Signal-to-noise ratio (SNR) calculations demonstrate the feasibility of increasing the stand-off distance from 5 to similar to 150 m, with a corresponding drop in SNR from 28 to 10 dB. (C) 2012 Optical Society of America
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