激光辐照引起的材料温度场和热应力场的瞬态分布

光电探测器吸收激光后的温升以及因温升造成的各种现象，致使探测器遭受到不同程度的损伤。利用热弹性理论对CO2激光器辐照K9玻璃材料进行研究，建立激光辐照材料温升及热应力分布二维平面模型，通过解析计算得到由激光辐照半导体材料引起的温度场和应力场的瞬态分布。研究表明, K9玻璃材料的激光辐照损伤阀值与辐照时间和光斑半径相关。在同一条件下,造成的热应力损伤阀值较熔融损伤的低，故K9玻璃材料的破坏形态为热应力破坏。

Abstract

Electro-optical detectors are widely used in many fields. However, temperature rise due to the absorption of laser and other phenomena may damage detectors. Using thermal elastic theory, the investigation on K9 material radiated by CO2 laser is done. According to the two-dimensional planar model, the transient distributions of temperature field and thermal stress field which result from laser radiation on semiconductor material are obtained by analytical calculation. The results show that the K9 glass damage threshold of laser radiation is dependent on the radiation time and beam radius. Under the same conditions, the thermal stress damage threshold is lower than the melting damage threshold, so the damage reason of K9 glass material is thermal stress damage.

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王刚, 徐强, 刘洋, 王虎, 梁晓东, 李艳, 陈志学. 激光辐照引起的材料温度场和热应力场的瞬态分布[J]. 应用光学, 2011, 32(4): 801. WANG Gang, XU Qiang, LIU Yang, WANG Hu, LIANG Xiao-dong, LI Yan, CHEN Zhi-xue. Transient distributions of temperature field and thermal stress field induced by laser irradiation[J]. Journal of Applied Optics, 2011, 32(4): 801.

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