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。
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 muhipulse 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.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2009年第11期1671-1676,共6页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(10604017
10675048)
武汉市晨光计划项目(20045006071-40)
关键词
飞秒激光烧蚀
多脉冲
能量剩余系数
温度演化
femtosecond laser ablation
multipulse
residual energy coefficient
temperature evolution
