Efficient Nanosecond Dual-Signal Optical Parametric Generator with a Periodically Phase Reversed PPMgLN

We report an efficient nanosecond optical parametric generator (OPG) with a periodically-phase-reversed periodically poled MgO:LiNbO₃(ppr-PPMgLN), which produces two pairs of signal and idler waves. The OPG is pumped by a 1.064μm Q-switched Nd:YVO₄ laser. When the repetition rate is set at 10kHz, the maximum average total output power of 570mW is achieved, including 410mW of dual-signal radiations and 160mW of dual-idler radiations. The total
conversion efficiency is 32.5%. The tunable dual-signal wavelengths in the range of 1.474--1.518μm and 1.490--1.539μm and the dual-idler of 3.826--3.558μm and 3.726--3.451μm are obtained by changing the crystal temperature from 30°C to 200μC.