Transient Stimulated Thermal Scattering in Colored Liquids

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Abstract
The results of a "small signal" theoretical treatment of the transient behavior of the stimulated thermal scattering of light by a small colored liquid sample are given. The analysis is applicable to an amplifier experimental set-up in which an undepleted pump beam and a small signal beam travel in opposite directions through the sample. In addition to reproducing features which have been previously predicted and experimentally confirmed, new features arise from terms which were neglected in previous analyses. For example, oscillatory behavior of the signal-beam gain factor can occur under certain conditions. It is also shown where the controversy of whether the Rayleigh lifetime τR or the Brillouin lifetime τB′ is the characteristic time for achieving steady-state stimulated thermal Brillouin scattering arises and how it is resolved.

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