Time Variations of Stimulated Raman Process and Effect of Relaxation

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Abstract
Stimulated Stokes emissions from Raman active media (CS2 and C6H6) have been observed by using a Q-switched ruby laser, which emits a multiple-pulse in each shot. A relation between intensities of the laser pulses and the corresponding stimulated Stokes pulses is not expressed by a simple proportion, because a certain relaxation phenomenon occurs in the Raman medium. The pulse shape of the laser light after transmission through the Raman medium also shows some asymmetric structure under the influence of the relaxation. Neither shock wave propagation nor a bubble produced by the laser beam is a possible origin of the observed effect. A saturation of transition between the vibrational levels by the stimulated Raman process is one of the plausible sources of the temporal variations of this process. The calculation is found to account for the observations.

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