| Thermal characteristics of double-layer thin film target ablated by femtosecond laser pulses |
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| 作者姓名： | 高勋 宋晓伟 林景全 |
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| 作者单位： | School of Science,Changchun University of Science and Technology |
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| 基金项目： | Project supported by the National Natural Science Foundation of China (Grant No. 60978014), the Natural Science Foundation of Jilin Province (Grant No. 20090523) and the Educational Commission of Jilin Province (Grant No. [2008]297). |
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| 摘 要： | Thermal characteristics of tightly-contacted copper-gold double-layer thin film target under ablation of femtosecond laser pulses are investigated by using a two-temperature theoretical model.Numerical simulation shows that electron heat flux varies significantly on the boundary of copper-gold film with different maximal electron temperature of 1.15 × 10 3 K at 5 ps after ablating laser pulse in gold and copper films,which can reach a balance around 12.6 ps and 8.2 ps for a single and double pulse ablation,respectively,and in the meantime,the lattice temperature difference crossing the gold-copper interface is only about 0.04×10 3 K at the same time scale.It is also found that electron-lattice heat relaxation time increases linearly with laser fluence in both single and double pulse ablation,and a sudden change of the relaxation time appears after the laser energy density exceeds the ablation threshold.
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| 关 键 词： | femtosecond laser ablation pulse train two-temperature model |
| 收稿时间： | 8/1/2010 12:00:00 AM |
| 修稿时间： | 9/1/2010 12:00:00 AM |
Thermal characteristics of double-layer thin film target ablated by femtosecond laser pulses |
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| Gao Xun,Song Xiao-Wei and Lin Jing-Quan.Thermal characteristics of double-layer thin film target ablated by femtosecond laser pulses[J].Chinese Physics B,2011,20(2):24210-024210. |
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| Authors: | Gao Xun Song Xiao-Wei and Lin Jing-Quan |
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| Institution: | School of Science, Changchun University of Science and Technology, Changchun 130022, China;School of Science, Changchun University of Science and Technology, Changchun 130022, China;School of Science, Changchun University of Science and Technology, Changchun 130022, China |
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| Abstract: | Thermal characteristics of tightly-contacted copper--gold double-layer thin film target under ablation of femtosecond laser pulses are investigated by using a two-temperature theoretical model. Numerical simulation shows that electron heat flux varies significantly on the boundary of copper--gold film with different maximal electron temperature of 1.15×103 K at 5 ps after ablating laser pulse in gold and copper films, which can reach a balance around 12.6 ps and 8.2 ps for a single and double pulse ablation, respectively, and in the meantime, the lattice temperature difference crossing the gold--copper interface is only about 0.04×103 K at the same time scale. It is also found that electron--lattice heat relaxation time increases linearly with laser fluence in both single and double pulse ablation, and a sudden change of the relaxation time appears after the laser energy density exceeds the ablation threshold. |
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| Keywords: | femtosecond laser ablation pulse train two-temperature model |
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