SRS generation of anti-stokes radiation under phase quasi-matching conditions

New methods of generation of anti-Stokes radiation of stimulated Raman scat tering in media with changeable parameters of the third-order nonlinearity chi ((3)) along the longitudinal coordinate are proposed. The conditions of obtaining phase quasi-matching in different media and reaching the maximum efficiency of conversion into the anti-Stokes component of stimulated scat tering are determined by numerical methods. The dependence of the efficienc y of energy transfer from the pump wave to the anti-Stokes wave on the rati o of intensities of the pump and Stokes waves at the input of the medium is studied. The models of the media in which the efficiency of generation of anti-Stokes radiation exceeds 30% are obtained. The results of the investig ation can be used for the development of new efficient nonlinear optical de vices upconverting the laser radiation frequency. (C) 2001 MAIK "Nauka/Inte rperiodica".