摘要
光学薄膜的吸收率影响元件的使用寿命,当薄膜受激光辐照后光斑内产生温度场,根据温度场可以计算光学薄膜的吸收损耗。首先搭建实验平台测试元件在激光辐照下的温度场,其次根据测试元件的温度场通过数值计算的方法模拟激光加热过程中的瞬态过程,最后通过比较数值计算的瞬态过程与元件的温度场求解材料吸收率的大小。结果显示,通过建立激光辐照光学元件的温度场模型,激光功率密度是影响温升大小的主要因素,其温度分布还受到对流热通量的影响,根据实验降温过程求出对流热通量为15 W/(m^(2)·K);通过温度场的模拟计算得到光学元件的吸收率为3.2×10^(-6),在增大功率后光学激光元件的温升趋势和温升大小保持一致,验证激光辐照模型的准确性,为不同类型光学原件的吸收率计算提供新方法。
The optical absorption loss of optical thin films can be assessed through the temperature field generated at the spot following laser irradiation.An experimental platform is established to measure the temperature field of the element under laser irradiation.Numerical calculations are employed to simulate the transient laser heating process based on the observed temperature field.Subsequently,the material absorptivity is determined by comparing the simulated transient process with the experimental temperature field.The results show that the laser power density is the main factor affecting the temperature rise,and the temperature graduation is also affected by the convective heat flux,which is 15 W/(m^(2)·K)according to the experimental cooling process.The temperature field simulation shows that the absorptivity of the high negative laser is 3.2 X 10^(-6).An increase in laser power results in consistent temperature rise trends and magnitudes for optical components,validating the accuracy of the laser irradiation model and presenting a novel method for calculating the absorption rates of various optical components.
作者
朱晔
王晨
张翀
郭重阳
Zhu Ye;Wang Chen;Zhang Chong;Guo Chongyang(Mechanical Engineering Institute,Dalian Jiaotong University,Dalian 116021,Liaoning,China)
出处
《应用激光》
北大核心
2025年第10期205-214,共10页
Applied Laser
关键词
吸收率
温度场
数值计算
光学元件
absorption rate
temperature field
numerical calculation
optical element
