a Department of Engineering Mechanics, Xi'an Jiaotong University, Xi'an 710049, China; b School of Architecture Engineering, Henan University of Science and Technology, Luoyang 471003, China
Abstract Based on the hyperbolic two-step heat conduction model, using the Laplace transform and numerical inverse transform method (Riemann-sum approximation method), the thermal behaviour of thin metal films has been studied during femtosecond pulse laser heating. Also the thermalization time, which is the time for the electron gas and solid lattice to reach thermal balance, has been studied in detail. The values of thermalization time for silver (Ag), gold (Au), copper (Cu) and lead (Pb) are obtained. The effects of material parameters of the thin metal film on the thermalization time are considered for the four kinds of metals by changing one of the parameters and regarding the other parameters as constant. For a typical metal material, the order of the thermalization time is of the order of hundreds of picoseconds. The thermalization time decays exponentially with the increase of phonon－electron coupling factor or electron gas thermal conductivity, and it increases linearly with the increase of the ratio of lattice heat capacity to electron gas heat capacity. However, the relaxation time of the electron gas has very little effect on the thermalization time.
Received: 09 January 2004
Revised: 15 May 2004
Accepted manuscript online:
(Ultraviolet, visible, and infrared radiation effects (including laser radiation))
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10132010).
Cite this article:
Xu Hong-Yu (徐红玉), Zhang Yuan-Chong (张元冲), Song Ya-Qin (宋亚勤), Chen Dian-Yun (陈殿云) Thermalization time of thin metal film heated by short pulse laser 2004 Chinese Physics 13 1758
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