中国物理B ›› 2007, Vol. 16 ›› Issue (7): 2003-2010.doi: 10.1088/1009-1963/16/7/033

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A study of ultrafast electron diffusion kinetics in ultrashort-pulse laser ablation of metals

杨建军1, 朱晓农1, 刘伟伟2   

  1. (1)Institute of Modern Optics, Nankai University, Key Laboratory of Opto-Electronic Information Science and Technology, Education Ministry of China, Tianjin 300071, China; (2)Institute of Modern Optics, Nankai University, Key Laboratory of Opto-Electronic Information Science and Technology, Education Ministry of China, Tianjin 300071, China ;Department de Physique, de Genie Physique et D'Optique and Centre d'Optique,Photoniqu
  • 收稿日期:2006-11-30 修回日期:2007-01-11 出版日期:2007-07-20 发布日期:2007-07-04
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No~60378007).

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)   

  1. 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
  • Received:2006-11-30 Revised:2007-01-11 Online:2007-07-20 Published:2007-07-04
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No~60378007).

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摘要： 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.

关键词: electron diffusion, femtosecond pulse, ablation

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.

Key words: electron diffusion, femtosecond pulse, ablation

中图分类号:  (Ultraviolet, visible, and infrared radiation effects (including laser radiation))

  • 61.80.Ba
61.82.Bg (Metals and alloys) 63.20.K- (Phonon interactions) 66.30.Fq (Self-diffusion in metals, semimetals, and alloys) 78.47.-p (Spectroscopy of solid state dynamics)