强激光束辐照下窗口材料热力效应数值模拟  

Thermal deformation of optical windows irradiated by high power laser beam

作　　者：王伟平[1] 谭福利[1] 吕百达[2] 

机构地区：[1]中国工程物理研究院流体物理研究所,绵阳621900 [2]四川大学激光物理与化学研究所,成都610064

出　　处：《激光技术》2005年第5期452-454,458,共4页Laser Technology

基　　金：国家八六三计划资助项目(863-802-4)

摘　　要：基于三维瞬态热传导方程和弹性应力-应变方程,研究了空心环形强激光束(波长1.315μm)辐照下白宝石窗口温度、变形和应力的分布规律;研究了空心矩形强激光束(波长3.8μm)辐照下氟玻璃窗口温度、变形和应力的分布规律。采用三维有限元模型,数值模拟了强激光在窗口材料中产生的热和力学效应,为强激光窗口元件的选择以及热效应对光束质量影响的评估提供了参考。计算中,激光能量吸收采用体吸收,并考虑了光强分布的空间梯度以及光强在窗口内的衰减。Based on three dimensional transient heat conduction equation and elastic stress-strain equation,the temperature rise, distortion and equivalent stress distribution of white bijou window irradiated by high power annular beam （λ = 1.315 μm） are simulated using a three dimensional finite element model（FEM）. The temperature rise ,distortion and equivalent stress distribution of fluoride glass window induced by high power hollow rectangular laser beam（ λ = 3.8μm） are also simulated. Laser intensity spatial gradient and attenuation in window are considered in computational model.

关 键 词：激光光学 强激光 光学窗口 温度场 变形 应力 

分 类 号：TN248[电子电信—物理电子学]