High-repetition-rate narrow pulse width mid-infrared optical parametric oscillator based on PPMgLN crystal

摘要

This paper reports a narrow pulse width optical parametric oscillator (OPO) based on periodically poled MgO:LiNbO3 (PPMgLN). When the maximum pumping power of the 1064 nm laser was 26.07 W, the acousto-optical (AO) Q-switch repetition rate was 70 kHz and the PPMgLN crystal grating period was 29 mu m; a 3840nm mid-infrared light output power of 4.86W was obtained at 150 C, corresponding to a pulse width of 9.56 ns. The optical optical conversion efficiency was about 18.6%. In addition, by changing the temperature between 25 degrees C to 200 degrees C, a tunable mid-infrared wavelength of 3765-3974nm output laser was achieved.