飞秒laser与金属相互作用中的材料分解机制
Material decomposition mechanisms in femtosecond laser interactions with metals
摘要：
对飞秒激光烧蚀过程进行了流体动力学数值模拟。材料分解的详细分析是使用独立的稳定和亚稳相态和相边界的完全状态方程。根据经典的均匀成核理论，估算了亚稳液态的寿命。此外，根据可用标准控制靶材料的机械破碎。结果，观察到几种烧蚀机制。然而，被烧蚀的材料的主要部分被发现源自亚稳液体区域，其在临界点附近被热分解成液体-气体混合物，或者在高应变速率和负压下被机械地分解成液滴和块。计算结果解释了已有的实验结果。
英文摘要：
A numerical hydrodynamic study of femtosecond laser ablation is presented. A detailed analysis of material decomposition is performed using a thermodynamically complete equation of state with separate stable and metastable phase states and phase boundaries. The lifetime of the metastable liquid state is estimated based on the classical theory of homogeneous nucleation. In addition, mechanical fragmentation of the target material is controlled based on available criteria. As a result, several ablation mechanisms are observed. A major fraction of the ablated material, however, is found to originate from the metastable liquid region, which is decomposed either thermally in the vicinity of the critical point into a liquid-gas mixture, or mechanically at high strain rate and negative pressure into liquid droplets and chunks. The calculation results explain available experimental findings.
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