A unified thermal model of thermophysical effects with pulse width from nanosecond to femtosecond

¹ Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, P.R. China
² State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, 430071, P.R. China

Corresponding author: ranranfang2@gmail.com

Received: 8 October 2007
Revised: 21 January 2008
Accepted: 11 March 2008
Published online: 30 April 2008

Abstract

This paper presents a unified thermal model, which can describe the thermophysical effects with laser pulse width ranges from nanosecond to femtosecond. Take gold target as an example, the numerical solutions are obtained from the unified model using a finite difference method. The temperature distribution of the electron and the lattice along with space and time at a certain laser fluence is presented. The time-dependence of lattice and electron temperature on the surface for different laser fluence is also performed. The satisfactory agreement between our numerical results and experimental results of vaporization threshold indicates that the unified thermal model is correct and reasonable.