| Thermal analysis of intense femtosecond laser ablation of aluminum |
| |
| 作者姓名： | 胡浩丰 吉扬 胡阳 丁晓雁 刘贤文 郭静慧 王晓雷 翟宏琛 |
| |
| 作者单位： | Institute of Modern Optics,Key Laboratory of Optoelectronic Information Science & Technology,Ministry of Education,Nankai University College of Precision Instruments and Optoelectronics Engineering,Tianjin University College of Information Technical Science,Nankai University |
| |
| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant Nos. 10904079 and 60838001), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20090031120041), and the Natural Science Foundation of Tianjin (Grant No. 10JCYBJC01300). |
| |
| 摘 要： | This paper numerically simulates the process of ablation of an aluminum target by an intense femtosecond laser with a fluence of 40 J/cm 2 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.
|
| 关 键 词： | femtosecond laser ablation two-temperature equation finite difference method thermal conduction of free electrons |
| 收稿时间： | 2010-05-28 |
Thermal analysis of intense femtosecond laser ablation of aluminum |
| |
| Hu Hao-Feng,Ji Yang,Hu Yang,Ding Xiao-Yan,Liu Xian-Wen,Guo Jing-Hui,Wang Xiao-Lei and Zhai Hong-Chen.Thermal analysis of intense femtosecond laser ablation of aluminum[J].Chinese Physics B,2011,20(4):44204-044204. |
| |
| Authors: | Hu Hao-Feng Ji Yang Hu Yang Ding Xiao-Yan Liu Xian-Wen Guo Jing-Hui Wang Xiao-Lei and 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 Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China;College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China;College of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China;College of Information Technical Science, Nankai University, Tianjin 300071, China;Institute of Modern Optics, Key Laboratory of Optoelectronic Information Science & Technology, Ministry of Education, Nankai University, Tianjin 300071, China;Institute of Modern Optics, Key Laboratory of Optoelectronic Information Science & Technology, Ministry of Education, 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 |
|
