高转换效率1.47μm PPLN光参量振荡器

1.47μm PPLN Optical Parametric Oscillator with High Conversation Efficiency

提出一种基于周期性极化铌酸锂(PPLN)晶体的高转换效率人眼安全光参量振荡器(OPO),使用Nd∶YVO4声光调Q激光器作为泵浦源,对信号光单谐振结构PPLN-OPO激光的输出特性进行理论分析和实验研究。结果表明:通过温度调谐的方式,实现了1.47~1.51μm信号光连续变化输出;在泵浦光输入功率为3.1 W时获得了最大光-光转换效率,为27.42%;在泵浦光脉冲宽度为64.3 ns、泵浦光输入功率为5.4 W、重复频率为30 kHz、PPLN晶体温度为30℃时,获得了脉冲宽度为18.74 ns、最大平均输出功率为1.06 W的1.47μm人眼安全激光输出。

An eye-safe optical parametric oscillator(OPO)with high conversion efficiency based on periodically polarized lithium niobate(PPLN)is demonstrated.In the experiment,a Nd∶YVO4acousto-optic Q-switched laser is used as the pump source.The laser output characteristics of signal-resonant PPLN-OPO are analyzed theoretically and experimentally.The results show that through temperature tuning,the wavelength of signal laser can continuously change at 1.47~1.51μm.At the pump laser input power of 3.1 W,a maximum pump-to-signal conservation efficiency of 27.42%is obtained.When the pulse width of pump laser is 64.3 ns,the pump laser input power is 5.4 W,repetition frequency is 30 kHz,the temperature of PPLN crystal is 30℃,the pulse width is 18.74 ns and the maximum average output power is 1.06 W at 1.47μm.