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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 15 — May. 20, 2012
  • pp: 2794–2807

Stand-off detection of solid targets with diffuse reflection spectroscopy using a high-power mid-infrared supercontinuum source

Malay Kumar, Mohammed N. Islam, Fred L. Terry, Jr., Michael J. Freeman, Allan Chan, Manickam Neelakandan, and Tariq Manzur  »View Author Affiliations


Applied Optics, Vol. 51, Issue 15, pp. 2794-2807 (2012)
http://dx.doi.org/10.1364/AO.51.002794


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Abstract

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 150 m , with a corresponding drop in SNR from 28 to 10 dB.

© 2012 Optical Society of America

OCIS Codes
(300.6340) Spectroscopy : Spectroscopy, infrared
(320.6629) Ultrafast optics : Supercontinuum generation

ToC Category:
Spectroscopy

History
Original Manuscript: November 7, 2011
Manuscript Accepted: December 19, 2011
Published: May 14, 2012

Virtual Issues
Vol. 7, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Malay Kumar, Mohammed N. Islam, Fred L. Terry, Michael J. Freeman, Allan Chan, Manickam Neelakandan, and Tariq Manzur, "Stand-off detection of solid targets with diffuse reflection spectroscopy using a high-power mid-infrared supercontinuum source," Appl. Opt. 51, 2794-2807 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-15-2794


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