OPTIMIZED COHERENT RAMAN SPECTROSCOPY
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Date
1978
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Publisher
Ohio State University
Abstract
The sensitivity of optical-heterodyne-detected Raman-induced-Kerr effect spectroscopy $(OHD-RIKES),^{1}$ is dramatically improved relative to other coherent Raman techniques. Spectra of transparent and luminescent samples with weak scattering cross-sections ate fully comparable to those obtained by spontaneous scattering, and the convenience of operation is superior to coherent-antistokes-Raman spectroscopy (CARS). 0HD-RIKES provides a spectral resolution United only by the linewidths of the lasers used, and allows fluorescence discrimination. The development of OHD-RIKES has enabled the first observation of the two-phonon coherent Raman spectra of diamond and the accurate determination of the spectral frequencies ($\pm 0.5$ $cm^{-1}$). Cross-sections of the resolved structures are nearly 1000 times smaller than the one-phonon peak, and more than 10 times weaker than the nonresonant background. The practical aspects of OHD-RIKES, as well as the enhanced signal-to noise ratio and the ability to separately observe the real (dispersive) and imaginary (gain or loss) contributions to the third-order optical susceptibility, will be discussed.
Description
$^{1}$G. L. Eesley, M. D. Levenson, and W. M. Tolles, ""Optically Heterodyned Coherent Raman Spectroscopy"", Journal of Quant. Elect., QE-14, No. 1, pp 45-49, Jan. 1978.""
Author Institution: Department of Electrical Engineering and Physics, Seaver Science Center, University of Southern California; Department of Electrical Engineering and Physics, Seaver Science Center, University of Southern California
Author Institution: Department of Electrical Engineering and Physics, Seaver Science Center, University of Southern California; Department of Electrical Engineering and Physics, Seaver Science Center, University of Southern California