激光辐照漫反射金属靶板温升研究

Study of the Temperature Increment of Diffusing Metal Target under Laser Irradiation

漫反射非接触测量方法是测量入射激光功率密度分布的有效手段。但强激光长时间辐照漫反射金属靶板，材料上升到一定温度表面反射率将显著下降，影响测量效果。基于有限元方法，结合热源抖动和风速对流，对镀金膜的铝板进行了强激光辐照条件下的温度变化模拟，结果表明材料表面能量吸收率是决定温度升高的关键因素。通过粗糙度设计可实现与光滑表面吸收率接近的漫反射表面，有效降低靶板温度，为优化漫反射金属靶板设计提供参考。

The diffusing non-contact measurement method is effective for measuring incident laser power density. However, the strong laser irradiates diffusing metal plane for a long time, which once makes the temperature of target plane rise to a degree, causing the surface reflection descend significantly. The measuring results are affected. Based on the finite element method, considering hot source and wind convection, the temperature changes of AI plane coated Au film are simulated under strong laser irradiation, the results show that the energy absorption is the key factor to temperature rising. The energy absorption reducing the temperature of target plane effectively. of diffusing surface can be designed similar to smooth surface, the optimum design reference for diffusing metal target plane is provided.