High signal-to-noise detection of rotational Raman scattering through refluorescent and dispersive atomic filters
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We introduce new methods for capturing rotational Raman scattering that simultaneously suppress background scattering and have exceedingly high spectral dispersion at low wavenumbers. These methods are based on resonant absorption and refractive index dispersion of atomic vapor, and take advantage of the availability of tunable lasers. Three different configurations are presented. The first is an atomic notch transmission filter which is based on refluorescence from an optically thick atomic vapor cell. This configuration is demonstrated in air using mercury vapor at 254 nm. The second configuration is an atomic resonance prism cell which is demonstrated in CO2 using mercury vapor, again at 254 nm. The third configuration is a density gradient atomic vapor cell which uses rubidium vapor at 780 nm. In the last two configurations, the atomic cell simultaneously blocks the elastic scattering while spatially dispersing the rotational Raman lines. In each case, a tunable Ti:sapphire laser was employed as an illuminating source. (C) 2000 John Wiley and Sons, Ltd.
author list (cited authors)
Miles, R. B., Tang, Z., Zaidi, S. H., Yalin, A., & Finkelstein, N.
complete list of authors
Miles, Richard B||Tang, Zhen||Zaidi, Sohail H||Yalin, Azer||Finkelstein, Noah