Thermal characteristics of double-layer thin film target ablated by femtosecond laser pulses

被引：0

作者：

高勋 ^{[1
]}

宋晓伟 ^{[1
]}

林景全 ^{[1
]}

机构：

[1] School of Science,Changchun University of Science and Technology

来源：

Chinese Physics B | 2011年 / 20卷 / 02期

基金：

中国国家自然科学基金;

关键词：

femtosecond laser ablation; pulse train; two-temperature model;

D O I：

暂无

中图分类号：

O484.4 [薄膜的性质];

学科分类号：

080501 ; 1406 ;

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.

引用

页码：286 / 290

页数：5

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