High-repetition-rate mid-infrared optical parametric oscillator based on PPMgOLN

A compact source of high-repetition-rate, high-efficiency, mid-infrared optical parametric oscillator (OPO) based on periodically poled MgO-doped lithium niobate (PPMgOLN) was reported. To ensure high conversion efficiency at high repetition rate, a high beam quality and high peak power Q-switched pump source was developed specially. The performances at different repetition rates were compared and average output power of 8.7 W at 3.8 μm was obtained when the pump power was 48 W at the repetition rate of 120 kHz with an optimal plane-concave resonator configuration. The conversion efficiency from the 1.06 μm laser to the 3.8 μm laser was 18.1%.