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Improved two-temperature model and its application in femtosecond laser ablation of metal target

Published online by Cambridge University Press:  14 April 2010

Ranran Fang ,
Duanming Zhang ,
Hua Wei ,
Zhihua Li ,
Fengxia Yang  and
Yihua Gao
Ranran Fang*
Affiliation:
College of Mathematics and Physics, Chongqing University of Posts and Telecommunications, Chongqing, China
Duanming Zhang
Affiliation:
School of Physics, Huazhong University of Science and Technology, Wuhan, China
Hua Wei
Affiliation:
Center for Modern Physics and Department of Physics, Chongqing University, Chongqing, China
Zhihua Li
Affiliation:
School of Physics, Huazhong University of Science and Technology, Wuhan, China
Fengxia Yang
Affiliation:
School of Physics, Huazhong University of Science and Technology, Wuhan, China
Yihua Gao
Affiliation:
School of Physics, Huazhong University of Science and Technology, Wuhan, China
*
Address correspondence and reprint requests to: Ranran Fang, College of Mathematics and Physics, Chongqing University of Posts and Telecommunications, Chongqing 400065, China. E-mail: ranranfang2@gmail.com
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Abstract

An improved two-temperature model to describe femtosecond laser ablation of metal target was presented. The temperature-dependent heat capacity and thermal conductivity of the electron, as well as electron temperature-dependent absorption coefficient and absorptivity are all considered in this two-temperature model. The tailored two-temperature model is solved using a finite difference method for copper target. The time-dependence of lattice and electron temperature of the surface for different laser fluence are performed, respectively. The temperature distribution of the electron and lattice along with space and time for a certain laser fluence is also presented. Moreover, the variation of ablation rate per pulse with laser fluence is obtained. The satisfactory agreement between our numerical results and experimental data indicates that the temperature dependence of heat capacity, thermal conductivity, absorption coefficient and absorptivity in femtosecond laser ablation of metal target must not be neglected. The present model will be helpful for the further experimental investigation of application of the femtosecond laser.

Keywords

Absorption coefficientAbsorptivityFemtosecond laserTwo-temperature model
Type
Research Article
Information
Laser and Particle Beams , Volume 28 , Issue 1 , March 2010 , pp. 157 - 164
Copyright
Copyright © Cambridge University Press 2010

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