Tunable Synchronously Pumped Intracavity Two-Stage Optical Frequency Upconversion.

摘要

Optical parametric oscillation (OPO) with intracavity sum-frequency generation (SFG) of the signal and pump has been studied theoretically and numerically, using the CW plane wave theory as well as a numerical code developed to simulate either synchronously pumped pulse propagation or walk-off effects in one transverse dimension. The configuration where the SFG crystal precedes the OPO crystal in the cavity gives stable high-efficiency conversion over a larger range of pump intensity, as well as lower power loading on the OPO crystal. About 85 percent conversion efficiency from 1.064 microns to 589 nm is predicted at pump intensities up to 9 MW/sq cm for a device using AgGaS2 and KTP crystals. Also, the angular distribution of parametric fluorescence from AgGaS2 has been calculated in good agreement with measurements made at the Phillips Laboratory.