The interactions of femtosecond lasers with gold targets are investigated with a numerical method combining molecular dynamics and two-temperature model and temperature dependent thermodynamic parameters. The influence of the electron temperature dependent (ETD) interatomic potential on ablation processes was analyzed. We also adopted an ETD electron–phonon coupling factor and further analyzed different ablation mechanisms under absorbed fluences ranging from Our simulation results showed good agreements on melting and ablation depth with both experiments and other simulations. Three ablation mechanisms were identified: nonthermal ablation caused by electronic pressure from the ETD interatomic potential, spallation by stresses from a rapid heating of the target and phase explosion due to explosive boiling. With a continuously updated ETD potential in accordance with electron temperature, one can explain the unique U shape profile of plume atomization degree as a function of laser fluence found in experiments.

用结合分子动力学和双温度模型以及温度相关的热力学参数的数值方法研究了飞秒激光器与金靶的相互作用。分析了电子温度依赖性（ETD）原子间电势对烧蚀过程的影响。我们还采用了ETD电子-声子耦合因子，并进一步分析了吸收通量范围为我们的模拟结果显示，在熔化和烧蚀深度方面，实验和其他模拟均具有良好的一致性。确定了三种消融机制：由ETD原子间电势产生的电子压力引起的非热消融，靶标快速加热产生的应力引起的剥落以及由于爆炸沸腾引起的相爆炸。通过根据电子温度不断更新的ETD电位，可以解释在实验中发现的羽状雾化程度的独特U形轮廓与激光能量密度的关系。