热效应不敏感的Z型全固态绿光激光器设计

为构建LD泵浦Nd∶GdVO4/KTP腔内倍频热效应不敏感的激光器系统，提高绿光激光的热稳定性，利用基于传播圆变换理论的Z型腔图解分析方法，得到光斑半径w2、w3随热动力参数1/ft的变换关系，利用Mathematics编程软件计算得到了具有激光晶体热透镜不敏性的Z型折叠腔参数。当激光器腔长参数为170mm, 523mm和152mm时，在20.3W的注入泵浦功率下获得了2.72W的531.5nm连续绿光激光输出，实现光 光转换率13%。通过传播圆变换理论图解分析方法的理论计算和实验研究，发现在1/ft小于0.25cm-1的情况下，该腔在激光晶体和倍频晶体处的光斑大小稳定，热效应不敏感，像散不明显。

Design of Z type all-solid-state green laser insensitive to thermal effect

In order to establish a LD-pumped Nd∶GdVO4/KTP laser system and improve the thermal stability of the green laser, the relation that the spot radii w2 and w3 vary with the thermodynamic parameter 1/ft were investigated with the graphic analysis method, and the parameters of three-mirror Z-type folded cavity insensitive to the variation of thermal lens effect of laser crystal were acquired by the calculation with Mathematics software. The continuous output green laser whose wavelength is 531.5nm and power is 2.72W was obtained at 20.3W end-pumping power when l1=170mm, l2=523mm and l3=152mm. The optical-optical conversion efficiency of 13% was realized with the all-solid-state laser. It is found that the laser system is insensitive to the variation of thermal lens effect when 1/ft＜0.25cm-1.