热容模式下片状Nd:GGG光学畸变的模拟和实验研究  

Simulation and experimental study of the optical distortions of Nd:GGG disk in heat-capacity laser

作　　者：李斐[1] 姜东升[2] 唐晓军[2] 王超[2] 杜涛[2] 张申金[2] 杨建坤[1] 

机构地区：[1]国防科学技术大学理学院,长沙410073 [2]固体激光技术国家重点实验室,北京100015

出　　处：《红外与激光工程》2007年第z1期314-317,共4页Infrared and Laser Engineering

摘　　要：基于二极管泵浦的固体热容激光器,采用有限元软件ANSYS模拟了泵浦光高斯分布条件下,圆片状Nd:GGG晶体内部的温度分布,计算并分析了热致折射率梯度和端面形变带来的光学畸变对热容激光器输出激光波前的影响。利用干涉法对介质的光学畸变进行了测量,提取出畸变的轮廓图,计算出等效热焦距,与模拟结果基本相符。结果表明:泵浦光与激光介质形状的不匹配将会使激光介质产生光学畸变,光学畸变的形状与泵浦光的形状密切相关。The temperature distribution in laser medium of LD pumped heat-capacity laser is simulated with the pump Gaussian distributed on the end surface of the medium by using ANSYS.The optical distortions which resulted from thermal refractive index gradient and the deformation of the end plane are calculated.The total distortion is measured by interference-method and its skeleton map is achieved.The result shows that distortions are caused by the inconsistent shapes of the pump and the laser medium,and their shapes rely on the pump shape.

关 键 词：光学畸变 不均匀泵浦 热容激光器 温度分布 Nd:CJGG 

分 类 号：TN248.1[电子电信—物理电子学]