Coherent anti-stokes Raman spectroscopy for detecting explosives in real time

Arthur Dogariu; Alex Pidwerbetsky

doi:10.1117/12.919568

4 May 2012 Coherent anti-stokes Raman spectroscopy for detecting explosives in real time

Arthur Dogariu, Alex Pidwerbetsky

Proceedings Volume 8358, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII; 83580R (2012) https://doi.org/10.1117/12.919568
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

We demonstrate real-time stand-off detection and imaging of trace explosives using collinear, backscattered Coherent Anti-Stokes Raman Spectroscopy (CARS). Using a hybrid time-resolved broad-band CARS we identify nanograms of explosives on the millisecond time scale. The broad-band excitation in the near-mid-infrared region excites the vibrational modes in the fingerprint region, and the time-delayed probe beam ensures the reduction of any non-resonant contributions to the CARS signal. The strong coherent enhancement allows for recording Raman spectra in real-time. We demonstrate stand-off detection by acquiring, analyzing, and identifying vibrational fingerprints in real-time with very high sensitivity and selectivity. By extending the focused region from a 100-micron sized spot to a 5mm long line we can obtain the spectral information from an extended region of the remote target with high spatial resolution. We demonstrate fast hyperspectral imaging by one-dimensional scanning of the Line-CARS. The three-dimensional data structure contains the vibrational spectra of the target at each sampled location, which allows for chemical mapping of the remote target.

Citation Download Citation

Arthur Dogariu and Alex Pidwerbetsky "Coherent anti-stokes Raman spectroscopy for detecting explosives in real time", Proc. SPIE 8358, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIII, 83580R (4 May 2012); https://doi.org/10.1117/12.919568

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