A study of ultrafast electron diffusion kinetics in ultrashort-pulse laser ablation of metals |
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Authors: | Yang Jian-Jun Liu Wei-Wei and Zhu Xiao-Nong |
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Institution: | 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, Photonique et Laser, Universite Laval, Quebec G1K 7P4, Canada |
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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. |
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Keywords: | electron diffusion femtosecond pulse ablation |
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