在准真空环境下,采用高功率密度的调Q-Nd:YAG激光照射固体铝靶表面,测量了不同入射激光强度下气化靶物质对靶的冲量.通过分析不同情况下激光与固态靶、气化物质的作用机理,采用流体力学理论和三维有限差分的计算方法,对不同激光强度情况下气化物质对靶产生冲量的过程进行了数值模拟,将模拟计算所得结果与实验测量结果进行了比较和分析,进而对实验结果进行了解释.由数值模拟结果与实验结果的一致性可见,本文采用的模型能反映激光作用下固体靶力学响应的物理过程.
The impulses of vaporized target material with solid target are measured by using the intense pulse of Q-Nd: YAG laser irradiating the solid target in quasi-vacuum. Analyzing the interaction mechanism of laser with target and vaporized target material, numerical calculation of impulse acting on the target with different laser intensity is performed with fluid dynamics theory and three-dimensional difference scheme. The comparison and analysis are performed between numerical and experimental results. The experimental results are given a reasonable explanation further. It is shown from the consistency between numerical results and experimental results that the numerical calculation model used in this paper can represent the mechanical response of the target to the laser.