【摘要】 提出了描述整个飞秒多脉冲激光烧蚀过程的物理模型,模型考虑了多脉冲烧蚀的新的特点,考虑靶材吸收率随温度的变化和蒸发效应,建立了激光烧蚀不同阶段的热传导方程,给出了相应的定解条件。以金靶材为例,利用有限差分法,求解了热传导动力学方程,分别给出单脉冲和多脉冲作用下相应的靶材电子和离子亚系统的温度演化图像,及多脉冲激光作用下能量剩余系数和脉冲个数的变化规律,发现理论曲线与相应的实验数据吻合较好。研究结果充分证明多脉冲激光烧蚀过程中剩余能量的存在。更多还原

【Abstract】 A new theoretical model has been developed to describe the whole ablation process,including the effect of dynamic absorptance and evaporation.Taking gold as an example,a finite difference method is employed to simulate the electron and lattice temperature evolution under the irradiation of single and multipulse femtosecond laser.The evolution of residual energy coefficient for multipulse as a function of pulse number is given.It is found that the calculated coefficients are in good agreement with the corresponding experimental data,proving the existence of residual energy during femtosecond multipulse ablation.更多还原