强激光烧蚀铝靶实验及数值模拟

为研究强激光对金属铝靶的毁伤效应及作用规律，进行了不同能量强脉冲激光烧蚀铝靶实验。采用纹影高速照相技术，观察了激光作用铝靶过程中形成的溅射产物和冲击波流场，获得了不同激光能量作用下铝靶的烧蚀特征。建立了强激光烧蚀铝靶的2维计算模型，对脉冲激光作用铝靶过程进行了数值模拟计算，获得了激光脉冲能量对铝靶烧蚀深度的影响规律。对连续强激光大光斑烧蚀铝靶过程进行了数值模拟计算，对比分析了有重力和无重力作用下烧蚀深度以及烧蚀形貌特征。结果表明，在重力作用下烧蚀深度小于无重力作用下的情况，而烧蚀面积大于无重力作用下的烧蚀面积。 

Experiment and Numerical Simulation of Ablation on Aluminum Target with High-Intensity Laser

In order to study the damage of high-intensity laser ablation to aluminum targets, a series of experiments with different laser energies were conducted. A high-speed schlieren photography technique with a double-pulse laser as background light source was used to observe the flow field of laser ablation on aluminum. The ablation characteristics of the aluminum target under different laser energies were obtained. A two-dimensional computation model for high-intensity laser ablation on aluminum targets was established, and the processes of pulse laser ablation on aluminum targets with different energies were conducted. The influences of the pulse laser energy on ablation depth were obtained. Numerical simulation of the process of continuous laser ablation of aluminum targets with large light spot was conducted. The ablation depth and ablation morphology under gravity and no gravity were compared and analyzed. The results show that the ablation depth under gravity is less than that without gravity, and the ablation area is greater than that without gravity.