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Proceedings Paper

Trace material detection of surfaces via single-beam femtosecond MCARS
Author(s): Sherrie S. Bowman Pilkington; Stephen D. Roberson; Paul M. Pellegrino
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Paper Abstract

There is a significant need for the development of optical diagnostics for rapid and accurate detection of chemical species in convoluted systems. In particular, chemical warfare agents and explosive materials are of interest, however, identification of these species is difficult for a wide variety of reasons. Low vapor pressures, for example, cause traditional Raman scattering to be ineffective due to the incredibly long signal collection times that are required. Multiplex Coherent Anti-Stokes Raman Scattering (MCARS) spectroscopy generates a complete Raman spectrum from the material of interest using a combination of a broadband pulse which drives multiple molecular vibrations simultaneously and a narrow band probe pulse. For most species, the complete Raman spectrum can be detected in milliseconds; this makes MCARS an excellent technique for trace material detection in complex systems. In this paper, we present experimental MCARS results on solid state chemical species in complex systems. The 40fs Ti:Sapphire laser used in this study has sufficient output power to produce both the broadband continuum pulse and narrow band probe pulse simultaneously. A series of explosive materials of interest have been identified and compared with spontaneous Raman spectra, showing the specificity and stability of this system.

Paper Details

Date Published: 12 May 2016
PDF: 8 pages
Proc. SPIE 9824, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVII, 98240F (12 May 2016); doi: 10.1117/12.2223768
Show Author Affiliations
Sherrie S. Bowman Pilkington, U.S. Army Research Lab. (United States)
Stephen D. Roberson, U.S. Army Research Lab. (United States)
Paul M. Pellegrino, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 9824:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVII
Augustus Way Fountain III, Editor(s)

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