强激光辐照铝靶温度分布数值模拟及实验研究  

Numerical simulation and experiment on temperature fields distribution of aluminum target under intensive laser

作　　者：王振宝[1] 吴勇[1] 杨鹏翎[1] 冯国斌[1] 张磊[1] 

机构地区：[1]西北核技术研究所激光与物质相互作用国家重点实验室,陕西西安710024

出　　处：《红外与激光工程》2014年第7期2061-2065,共5页Infrared and Laser Engineering

基　　金：激光与物质相互作用国家重点实验室创新基金(SKL111103)

摘　　要：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。Laser energy coupling coefficients of surface of aluminum target were obtained by different technics, such as sandblast, roughening by sand paper and plating gold. According to classical Fourier heat conduction equation, the theoretical model for numerical simulation on temperature fields of aluminum target under intensitive laser was built up. The software based on finite element method was used to analyze temperature field distribution of aluminum target under continuous-wave （CW） laser irradiation. Temperature field distribution of aluminum target with different surface roughness was calculated, when incident laser was regular beam or Gauss beam. In authentication test, the maximum temperature rise of back surface at the center of laser beam which irradiated on surface of aluminum target was measured by thermocouple. Comparison of the numerical results with the experimental results shows the availability of the finite element method. Analyzing ablation morphology after laser irradiation, the results are coincident with the numerical simulation.

关 键 词：强激光 表面处理 耦合系数 温度场 有限元 

分 类 号：TN249[电子电信—物理电子学]