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5 May 2010Improved Raman sensitivity using polarization analysis
Raman spectroscopy is a very powerful technique for molecular identification, and small Raman instruments have been
used successfully to identify toxic substances. The sensitivity of the technique, however, can be limited by fluorescence
interference arising from the analyte itself or sample impurities. In the case of surface detection, the Raman signature
and/or fluorescence from the surface can also interfere with identification of the target chemical. We take advantage of
the polarization characteristics of the Raman scattering to reduce the broadband fluorescence background and surface
Raman features. Using a custom fiber optic probe with excitation at 785 nm, we have demonstrated real-time
polarization analysis. The spectrum obtained by ratioing the parallel and perpendicular polarization components of the
Raman scattering, reduces the surface signature and has a better spectral correlation to the target analyte.
Steven Christesen
"Improved Raman sensitivity using polarization analysis", Proc. SPIE 7665, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI, 76651B (5 May 2010); https://doi.org/10.1117/12.851007
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Steven Christesen, "Improved Raman sensitivity using polarization analysis," Proc. SPIE 7665, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XI, 76651B (5 May 2010); https://doi.org/10.1117/12.851007