蓝宝石长波连续激光热力学损伤特性研究

摘要

Thermodynamics damage characteristics of sapphire from 10.6 μm CW laser are studied. The reflectivity and transmissivity of sapphire samples are obtained by means of Fourier spectrograph, which indicates that the pivotal laser wave band which sapphire needs to be protected is 7~11 μm.An axisymmetrical model of sapphire is built, and thermodynamics damage characteristics of sapphire from la-ser is simulated using the finite element software of ANSYS.The distribution of temperature and stress and response time characteristic of the model are analysed, then the damage threshold of sapphire sample is obtained.Finally, laser damage experimentations on sapphire samples are performed with 10.6 μm CW laser,which indicates that the results of simulation and experimentations are accordant.This shows that the simulation model of sapphire laser irradiation is reasonable.%对蓝宝石在10．6μm连续激光作用下热力学损伤特性进行研究。利用傅立叶光谱仪测试蓝宝石样件的反射率和透过率，明确蓝宝石需重点防护的激光波段为7～11μm；建立了蓝宝石轴对称模型，利用有限元软件ANSYS对激光照射蓝宝石材料的热力学特性进行数值模拟，分析了模型中温度和应力分布，以及时间响应特性，得到蓝宝石损伤阈值；并通过采用10．6μm连续激光对蓝宝石样件的损伤试验，验证了仿真结果和试验结果的一致性，表明所建立的蓝宝石激光辐照仿真模型具有合理性。