17 February 2010 Filament-based stimulated Raman spectroscopy
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A new multiplexed stimulated Raman spectroscopic technique encompassing a single-shot spectral measurement range of over 3900 cm-1 is presented. Impulsive excitation of all Raman active vibrational modes present in a medium is achieved by self-compression of a laser pulse undergoing filamentation in air, creating coherent vibrational wave-packets. These wave-packets create a macroscopic polarization of the medium that imparts sidebands on a delayed narrowband probe pulse. The background-free measurement of impulsively excited Raman modes in gas-phase N2, O2, H2, CO2, toluene, ammonia, and chloroform with a spectral resolution of 25 cm-1 is presented.
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J. H. Odhner, D. A. Romanov, R. J. Levis, "Filament-based stimulated Raman spectroscopy", Proc. SPIE 7582, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX, 75820M (17 February 2010); doi: 10.1117/12.842129; https://doi.org/10.1117/12.842129

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