RAMAN OSCILLATION WITH INTRACAVITY 2ND-HARMONIC GENERATION

We use a plane-wave analysis to examine a Raman oscillator containing an intracavity second harmonic interaction that frequency doubles the circulating first-order Stokes radiation. We find that there is an opt imum ratio between the nonlinear coupling in the Raman medium and the nonlinear coupling in the frequency doubler. We also find that higher order Stokes radiation should be suppressed with the optimum choice of nonlinear coupling in the frequency doubler. We present numerical int egration results that model the stimulated Raman scattering and second harmonic generation in three spatial dimensions. Quantum efficiencies as large as 48% are predicted from planewave theory and 43% are obtai ned from numerical integration of the equations containing transverse effects.