Journal
APPLIED PHYSICS LETTERS
Volume 92, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2918014
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We demonstrate a single-beam, standoff (>10 m) detection and identification of various materials including minute amounts of explosives under ambient light conditions. This is obtained by multiplex coherent anti-Stokes Raman scattering spectroscopy (CARS) using a single femtosecond phase-shaped laser pulse. We exploit the strong nonresonant background for amplification of the backscattered resonant CARS signals by employing a homodyne detection scheme. The simple and highly sensitive spectroscopic technique has a potential for hazardous materials standoff detection applications. (C) 2008 American Institute of Physics.
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