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:Li NbO3(ppr-PPMgLN), which produces two pairs of signal and idler waves. The OPG is pumped by a 1.064 mu m Q-switched Nd:YVO4 laser. When the repetition rate is set at 10 kHz, the maximum average total output power of 570 mW is achieved, including 410 mW of dual-signal radiations and 160 mW of dual-idler radiations. The total conversion efficiency is 32.5%. The tunable dual-signal wavelenghts in the range of 1.474-1.518 mu m and 1.490-1.539 mu m and the dual-idler of 3.826-3.558 mu m and 3.726-3.451 mu m are obtained by changing the crystal temperature from 30 degrees C to 200 degrees C.