Abstract

A new type of stimulated scattering (SS) of light waves with resonant frequency of the working transition in the inverted Nd:YAG was observed recently.¹ The effect with low- threshold power of the initial beam cannot be explained by ordinary mechanisms of SS or amplification of spontaneous emission. As we have supposed, the new SS is associated with the reflection of a light wave from a refractive index grating that is caused by the population grating in the laser crystal (LC) with different polarizabilities of excited and unexcited ions. On the other band, the estimations of stationary threshold of the effect have showed that this mechanism of SS can he realized only for the high polarizability difference of Nd:YAG (much more than the one measured experimentally²). Besides, the first investigations revealed that the scattering wave with the same frequency as the initial wave (with millisecond time duration) has a nonstationary pulse shape. In this report we present the study of the origin and dynamics of the transient stimulated resonant backscattering (SRBS) of the light beam in the inverted LC.

© 1997 Optical Society of America