LiNbO3电光调谐光学参变振荡器

在光学参变振荡器中 ,角度或温度调谐方式的最大缺陷就是参变光波长变化较慢 ,调谐操作复杂 ;电光调谐方式具有调谐速度快 ,操作简单的优点。利用非线性光学晶体LiNbO3 的电光效应 ,在 1 0 6 4 μmNd∶YAG激光器输出的抽运光作用下 ,切割角θ =4 7.5°,在垂直于 1.0 6 μm抽运光偏振方向上加 - 4 .5 +4.5kV直流电压 ,实现参变光波长调谐输出 ,输出光能量约为 2 6mJ左右 ,转换效率 η≈ 17.3%。实验所得的参变光波长变化与调谐电压的线性关系与理论计算相吻合 ,为实现光学参变振荡器的快速调谐快速输出提供了一种可行的技术途径。

LiNbO3 Electrooptic Tuning Optical Parametric Oscillator

The main problems of classical angle-tuning and temperature-control tuning in optical parametric oscillator are the complexity of operation and slowness of tuning rate. However, electrooptic tuning takes advantage over in operation and rates. Based on the electrooptical effect of the nonlinear optic crystal LiNbO3, pumped by 1.064 μm Nd∶YAG laser, when the cut angle θ=47.5°, DC voltage varying in the range of -4.5～4.5 kV is applied to LiNbO3 and tunable output of optical parametric oscillator is obtained. The maximum output energy is ～2.6 mJ and the conversion efficiency η is ～17.3%. The experimental results agree well with the theoretical calculation. This is a viable novel approach for changing the optical parametric wavelength.