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The theory of stimulated Raman effect in biaxial and uniaxial crystals is presented on the basis of a parametric process. For the system consisting of Stokes wave and polariton wave a dispersion relation is derived which allows to predict the threshold value of the stimulated process and the gain factor for real crystals.

Zur Theorie des stimulierten Raman-Effektes an Kristallen/ Theory of Stimulated Raman Effect in Cyrstals