YAG激光晶体热致双折射的非线性分析  

Nonlinear analysis of thermal induced birefringence of YAG laser crystal

作　　者：田佳[1,2] 胡健[1,2] 王珂[1,2] 王海林[1,2] 朱长虹[1,2] 朱广志[1,2] 齐丽君[1,2] 朱晓[1,2] 

机构地区：[1]华中科技大学光学与电子信息学院,武汉430074 [2]华中科技大学激光加工国家工程研究中心,武汉430074

出　　处：《激光技术》2015年第4期520-524,共5页Laser Technology

摘　　要：为了克服线性模型在描述高功率运转的激光晶体时,热焦距和热致双折射计算值与实测值不符的缺点,采用非线性热传导模型,计算了常用[111]切割方向Nd∶YAG激光晶体的热致双折射椭圆分布以及径向和切向热焦距。进行了平均热焦距数据测量和旋转线偏振光干涉实验,实验结果与理论分析吻合。结果表明,非线性模型对Nd∶YAG激光晶体在高功率运转时的描述更符合实际情况,普适性更强。这一结果对于设计高功率径向或切向偏振固体激光器是有帮助的。To overcome the shortage of mismatch of the calculated value and the measured value of thermal induced birefringence and thermal focal length when applying linear heat conduction model to describe a laser crystal operating in high power , based on nonlinear heat conduction model analysis , the distribution of the thermal induced birefringence ellipse and the radial or tangential thermal focal length in a Nd ∶YAG laser crystal of common [ 111 ]-cut were analyzed .The average thermal focal length data and rotated interference pattern of linearly polarized light were measured . The experimental results fit the theoretical analysis .The results show that nonlinear model provides more realistic and more general description for an Nd∶YAG laser crystal in [111]-cut.The result is helpful for the design of radial or tangential polarized high power solid-state lasers.

关 键 词：非线性光学 热致双折射 旋转线偏振光干涉 Nd∶YAG激光晶体 

分 类 号：TN244[电子电信—物理电子学]