PPLN准相位匹配内腔光学参量振荡器的实验研究

Experimental Study on Quasi-phase-matched Intracavity Optical Parametric Oscillator with PPLN

将准相位匹配光学参量振荡器（QPM-OPO）置于激光二极管（LD）端面泵浦的声光调Q1064nm-Nd：YVO4激光器谐振腔之内,获得了信号光单谐振的内腔光参量输出。在声光Q开关重复频率为25kHz的条件下,内腔参量振荡的阈值仅为0.9W（LD功率）。在6WLD泵浦功率下,获得了350mW的信号光输出。通过在120℃～250℃范围内改变PPLN晶体的温度,信号光输出实现了在（1493～1538）nm波段的调谐。

A quasi-phase-matched intracavity singly resonant optical parametric oscillator （QPM-IOPO） internal to a diode-end-pumped acousto-optically （AO） Q-switched 1 064 nm Nd：YVO4laser is demonstrated. The IOPO threshold is 0.9 W （ diode laser power） at a Q-switch repetition rate of 25 kHz. At an incident diode pump power of 6 W, an average signal output power of 350 mW is obtained. By varying the PPLN crystal temperature from （ 120 ～ 250）℃, the signal wavelength can be tuned in the range （1 493 ～ 1 538 ） nm.