Effects of Phonon Lifetime on Stimulated Optical Scattering in Gases

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Abstract
The effects of transient conditions on stimulated Brillouin and Raman scattering have been investigated by varying the lifetime of the scattered phonon over four orders of magnitude. The Stokes gain coefficients calculated from our experimental data are as much as several orders of magnitude less than those predicted using steady-state theory, but they are in excellent quantitative agreement with those predicted by a transient analysis which considers the buildup of the phonon population with time. The dependence of the Stokes intensity on laser power for stimulated Brillouin scattering is found to be in good agreement with the transient theory. However, the theory fails to predict properly the buildup of the Stokes intensity for either rotational or vibrational Raman transitions.

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