High-resolution stimulated Brillouin gain spectroscopy of liquid carbon disulfide: Dependence of the linewidths and peak gain on scattering angle
We have used narrow linewidth continuous-wave lasers to obtain high-resolution stimulated Brillouin gain (SBG) spectra of liquid carbon disulfide at various scattering angles. For back-scattering angles, the linewidths of the SBG peaks reflect the natural lifetimes of the stimulated acoustic waves, whereas for forward-scattering angles the linewidths are dominated by laser jitter and by the uncertainty in the scattering wave vector that results from focusing the laser beams in the interaction region. The peak gain for the forward-scattering SBG spectra is an order of magnitude smaller than that observed at a back-scattering angle of 178°. The dependence of the peak gain on scattering angle can be accounted for quantitatively by considering the angle dependencies of the Brillouin frequency, linewidth, and laser beam crossing efficiency. © 1992 American Institute of Physics.
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