Stimulated Raman scattering by polaritons in a transversely bounded layer of a nonlinear crystal

It is shown that the gain of the Stokes radiation in stimulated Raman scattering by polaritons can be increased by reflection from the side surfaces in a layer of a nonlinear crystal whose thickness is close to the pump beam diameter but is much greater than the transverse shift of the Stokes waves parallel to the crystal length. The steady-state energy characteristics are considered (for strong and weak polariton damping) in a system with feedback in respect of one of the waves excited in the layer. It is shown that when the resonator Q factor is sufficiently high, the major part of the pump radiation energy is converted into the resonant Stokes wave.