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采用喷砂、磨砂、镀金表面处理工艺得到了铝靶的激光能量耦合系数。从经典傅里叶热传导方程出发,建立了强激光辐照铝靶下铝靶温度场分布数值模拟理论模型。利用有限元软件,模拟计算了连续激光辐照下铝靶的温度场分布,给出了连续均匀光斑和高斯光斑辐照下,不同表面处理工艺的铝靶所对应的最大温升。开展了铝靶强激光辐照验证实验,利用热电偶实际测量得到了辐照激光光斑中心对应的铝靶背表面最大温升,该实验结果与计算结果吻合较好。对铝靶前表面的烧蚀形貌进行了分析,与理论计算的温度场分布情况相符合,验证了数值模拟的有效性。
The laser energy coupling coefficient of aluminum target was obtained by sandblasting, frosting and gold plating surface treatment. Based on the classical Fourier heat conduction equation, a theoretical model of temperature distribution in aluminum target under intense laser irradiation aluminum target was established. Using finite element software, the temperature field distribution of aluminum targets under continuous laser irradiation was simulated and the maximum temperature rise corresponding to aluminum targets with different surface treatments under continuous uniform spot and Gaussian spot irradiation was given. The aluminum target intense laser irradiation experiment was carried out. The maximum temperature rise of aluminum target back surface corresponding to the center of the irradiated laser spot was measured by thermocouple. The experimental results are in good agreement with the calculated results. The ablation morphology of the front surface of the aluminum target was analyzed, which was in good agreement with the theoretically calculated temperature field distribution, which verified the validity of the numerical simulation.