A study of ultrafast electron diffusion kinetics in ultrashort-pulse laser ablation of metals
Yang Jian-Jun(杨建军)a) † , Liu Wei-Wei(刘伟伟)a) b), and Zhu Xiao-Nong(朱晓农)a)
a Institute of Modern Optics, Nankai University, Key Laboratory of Opto-Electronic Information Science and Technology, Education Ministry of China, Tianjin 300071, China; b Department de Physique, de Genie Physique et D'Optique and Centre d'Optique, Photonique et Laser, Universite Laval, Quebec G1K 7P4, Canada
Abstract Temperature dependence of the electron diffusion in metallic targets, where the electron--electron collision is the dominant process, is investigated with the help of an extended two-temperature model. In sharp contrast to the low electron temperature case, where only the electron---phonon collisions are commonly considered, the electron diffusion process underlying the high electron temperatures evolves dramatically different in both temporal and spatial domains. Calculated results of the ablation yield at different pulse durations are presented for a copper plate impinged by ultrashort laser pulses with energy fluences ranging from 0.1 J/cm2 to 10 J/cm2. The excellent agreement between the simulation results and the experimental data indicates the significant role of electron--electron collisions in material ablations using intense ultrashort laser pulses.
Received: 30 November 2006
Revised: 11 January 2007
Accepted manuscript online:
PACS:
61.80.Ba
(Ultraviolet, visible, and infrared radiation effects (including laser radiation))
Fund: Project supported by the National Natural
Science Foundation of China (Grant No~60378007).
Cite this article:
Yang Jian-Jun(杨建军), Liu Wei-Wei(刘伟伟), and Zhu Xiao-Nong(朱晓农) A study of ultrafast electron diffusion kinetics in ultrashort-pulse laser ablation of metals 2007 Chinese Physics 16 2003
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