Continuous-wave 532-nm-pumped singly resonant optical parametric oscillator with periodically poled KTiOPO4

Abstract We report on a continuous-wave singly resonant optical parametric oscillator (SRO) based on periodically poled KTiOPO 4 . This is pumped by a frequency-doubled single-frequency Nd:YAG master oscillator power amplifier system. Pump wave enhancement allowed for external oscillation thresholds around 200 mW. Up to 72 mW of idler and 28 mW of signal radiation were generated at 1.2 W pump power. Output wavelengths between 865 and 1384 nm were obtained with a single 9 μm period grating by varying the crystal temperature from 37.5°C to 225°C. Mode-hop-free operation of the SRO was demonstrated for up to 69 min.