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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 31 — Nov. 1, 2008
  • pp: 5767–5776

Detection of condensed-phase explosives via laser-induced vaporization, photodissociation, and resonant excitation

C. M. Wynn, S. Palmacci, R. R. Kunz, K. Clow, and M. Rothschild  »View Author Affiliations


Applied Optics, Vol. 47, Issue 31, pp. 5767-5776 (2008)
http://dx.doi.org/10.1364/AO.47.005767


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Abstract

We investigate the remote detection of explosives via a technique that vaporizes and photodissociates the condensed-phase material and detects the resulting vibrationally excited NO fragments via laser- induced fluorescence. The technique utilizes a single 7 ns pulse of a tunable laser near 236.2 nm to perform these multiple processes. The resulting blue-shifted fluorescence ( 226 nm ) is detected using a photomultiplier and narrowband filter that strongly block the scatter of the pump laser off the solid media while passing the shorter wavelength photons. Various nitro-bearing compounds, including 2,6-dinitrotoluene (DNT), 2,4,6-trinitrotoluene (TNT), pentaerythritol tetranitrate (PETN), and hexahydro-1,3,5- trinitro-1,3,5-triazine (RDX) were detected with a signal-to-noise of 25 dB . The effects of laser fluence, wavelength, and sample morphology were examined.

© 2008 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(280.3420) Remote sensing and sensors : Laser sensors
(300.2530) Spectroscopy : Fluorescence, laser-induced

ToC Category:
Remote Sensing and Sensors

History
Original Manuscript: May 20, 2008
Revised Manuscript: August 22, 2008
Manuscript Accepted: September 11, 2008
Published: October 23, 2008

Citation
C. M. Wynn, S. Palmacci, R. R. Kunz, K. Clow, and M. Rothschild, "Detection of condensed-phase explosives via laser-induced vaporization, photodissociation, and resonant excitation," Appl. Opt. 47, 5767-5776 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-31-5767

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