Thermal analysis of intense femtosecond laser ablation of aluminum |
| |
Authors: | Hu Hao-Feng Ji Yang Hu Yang Ding Xiao-Yan Liu Xian-Wen Guo Jing-Hui Wang Xiao-Lei Zhai Hong-Chen |
| |
Affiliation: | Institute of Modern Optics, Key Laboratory of Optoelectronic Information Science & Technology, Ministry of Education, Nankai University, Tianjin 300071, China; College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China; College of Information Technical Science, Nankai University, Tianjin 300071, China |
| |
Abstract: | This paper numerically simulates the process of ablation of an aluminum target by an intense femtosecond laser with a fluence of 40 J/cm2 based on the two-temperature equation, and obtains the evolution of the free electron temperature and lattice temperature over a large temporal and depth range, for the first time. By investigating the temporal evolution curves of the free electron temperature and lattice temperature at three representative depths of 0, 100 nm and 500 nm, it reveals different characteristics and mechanisms of the free electron temperature evolution at different depths. The results show that, in the intense femtosecond laser ablation of aluminum, the material ablation is mainly induced by the thermal conduction of free electrons, instead of the direct absorption of the laser energy; in addition, the thermal conduction of free electrons and the coupling effect between electrons and lattice will induce the temperature of free electrons deep inside the target to experience a process from increase to decrease and finally to increase again. |
| |
Keywords: | femtosecond laser ablation two-temperature equation finite difference method thermal conduction of free electrons |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|