采用耦合双温度模型的分子动力学方法对飞秒激光照射金箔的传热过程进行了模拟研究,利用序参数法对固相原子和液相原子进行了区分并获取了固液界面的位置及温度随时间的变化规律。在此基础上探究了激光能流密度对熔化过程的影响。结果表明,随着激光能量的吸收及传递,金原子逐渐由面心立方的规则排列变为无序的松散排列,固液界面随时间逐步向金箔底部移动,金箔体积不断变大。当激光能流密度较小时,金箔未完全熔化,且熔化发生时刻较晚。激光能流密度越大,金箔熔化越早越快,熔化深度也越大,固液界面处温度也越高。 The heat transfer process of femtosecond laser irradiated gold foil was simulated by molecular dynamics method coupled with dual temperature model. The order parameter method was used to distinguish the solid phase atoms from the liquid phase atoms and to obtain the location and temperature of the solid-liquid interface Variation with time. Based on this, the influence of laser fluence on the melting process was explored. The results show that with the absorption and transmission of laser energy, the gold atoms gradually change from a regular arrangement of face-centered cubic to a disordered loose arrangement. The solid-liquid interface gradually moves toward the bottom of the gold foil with time and the volume of the gold foil becomes larger. When the laser fluence is small, the gold foil does not melt completely, and the melting occurs later. The greater the laser fluence, the sooner the melted gold melts, the greater the melting depth and the higher the temperature at the solid-liquid interface.