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4 May 2012 Nondestructive detection and imaging of trace chemicals with high-chemical specificity using single-beam coherent anti-stokes Raman scattering in a standoff configuration
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Abstract
The excellent chemical identification ability of Raman based spectroscopy provides a versatile and widely applicable method to identify hazards within a complex chemical environment. However, the small spontaneous Raman scattering cross section can limit standoff detection of trace quantities. Coherent anti-Stokes Raman scattering provides the same chemical specificity, but with the potential for much greater signal due to coherent addition in the non-linear spectroscopy. Utilizing CARS, we have demonstrated μg/cm2 level detection of an explosive simulant using a single laser producing less than 8mW of laser power in the near IR. This detection level was achieved on a simulant present as only a small part within a polymer mixture. In addition, we present standoff chemical images of trace compounds within a complex chemical environment, which effectively demonstrate the unique capabilities of the method. Further, the temporal pulse shape can be tailored to excite specific Raman transitions, adding versatility to this method.
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Marshall T. Bremer, Vadim V. Lozovoy, and Marcos Dantus "Nondestructive detection and imaging of trace chemicals with high-chemical specificity using single-beam coherent anti-stokes Raman scattering in a standoff configuration", Proc. SPIE 8358, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII, 835818 (4 May 2012); doi: 10.1117/12.919404; https://doi.org/10.1117/12.919404
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