高重频声光调Q Nd:YVO_4激光器2.1μm光参量振荡器

2.1 μm optical parametric oscillator based on high-repetition Q-switch Nd:YVO_4 laser

采用LD端面抽运Nd:YVO4激光器,在声光Q开关重复频率为50 k Hz、LD最大泵浦功率50 W时,获得输出功率26.37 W、脉冲宽度26.28 ns的1 064 nm激光输出。通过该系统抽运键合KTP外腔式光参量振荡器(OPO),当LD泵浦电流24 A、对应1 064 nm泵浦功率7.36 W时,实现了重频50 k Hz的2.174μm脉冲激光输出,激光平均输出功率为324 m W,激光脉宽为17.8 ns。同时,通过实验分析了不同输出镜透过率和声光调Q激光重频对1.064μm和2.1μm激光输出功率、脉宽的影响。最后通过理论值与实验测量值的对比得出,两组数据基本吻合,且2.1μm输出功率未出现饱和。

A Nd：YVO4 laser end-pumped by laser diode was designed, when the repetition frequency of acousto-optical Q-switch was 50 kHz, LD pump power was 50 W, the output power of 26.37 W and pulse width of 26.28 ns was obtained. And with this arrangements, by pumping external cavity OPO with bonding KTP crystal, when the LD pump current was 24 W, corresponding to the 1 064 nm laser power of 7.36 W, the wavelength of 2.174 μm pulse laser was achieved, the average power was 324 mW and pulse width was 17.8 ns. Meanwhile, the laser output power and pulse width of 1.064 μm and 2.1 μm under different output transmission and repetition frequency was analyzed in experiment. At last, by comparing the calculated date and measured date in experiment, the results show that the measured date is consistent with the calculated date, and the output power is not saturated.