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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 6    December 2009

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Theoretical and experimental study of energy transportation and accumulation in femtosecond laser ablation on metals
TAN Xin-yu(谭新玉)1, 2,ZHANG Duan-ming(张端明)3, MAO Feng(毛 峰)1,
LI Zhi-hua(李智华)3, YI DI(易 迪)2, ZHANG Xiao-zhong(章晓中)2

1. School of Science, China Three Gorges University, Yichang 443002, China;
2. Key Laboratory of Advanced Materials, Department of Materials Science and Engineering,
Tsinghua University, Beijing 100084, China;
3. School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China

Abstract:The energy transportation and accumulation effect for femtosecond (fs) laser ablation on metal targets were studied using both theoretical and experimental methods. Using finite difference method, numerical simulation of energy transportation characteristics on copper target ablated by femtosecond laser was performed. Energy accumulation effects on metals of silver and copper ablated by an amplified Ti: sapphire femtosecond laser system were then studied experimentally. The simulated results show that the electrons and lattices have different temperature evolvement characteristics in the ablation stage. The electron temperature increases sharply and reaches the maximum in several femtoseconds while it needs thousands of femtoseconds for lattice to reach the maximum temperature. The experimental results show that uniform laser-induced periodic surface structures (PSS) can be formed with the appropriate pulsed numbers and laser energy density. Electron-phonon coupling coefficient plays an important role in PSS formation in different metals. Surface ripples of Cu are more pronounced than those of Au under the same laser energy density.

 

Key words: femtosecond laser ablation; energy transportation; energy accumulation; periodic surface structure

ISSN 1672-7029
CN 43-1423/U

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