Metal absorptivity in femtosecond pulsed laser ablation |
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Authors: | Li Li Zhang Duan-ming Li Zhi-hua Tan Xin-yu and Fang Ran-ran |
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Institution: | (1) Department of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China |
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Abstract: | In this paper, the effect of the absorptivity of metal on femtosecond pulsed laser ablation is investigated. The formulas
for the absorptivity depending on target temperature are derived from Maxwell Equations and the Lambert-Beer’s law. Based
on this, a new two-temperature model is proposed to describe the femtosecond pulsed laser ablation with metal. Then, using
Au as an example, a finite difference method is employed to simulate the space-dependent and time-dependent absorptivity and
the target temperature. The temperature evolution of our model is compared with the result obtained form the heat conduction
model taking the absorptivity as constant. It is shown that the absorptivity plays an important role in the femtosecond pulsed
laser ablation. The results of this paper are helpful in choosing the best technical parameters in femtosecond pulsed laser
ablation.
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Keywords: | absorptivity femtosecond pulsed laser ablation two-temperature model target temperature |
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