Thermal behavior of thin metal films irradiated by shaped femtosecond pulse sequences laser

Thermal behavior of thin metal films irradiated by shaped femtosecond pulse sequences laser
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成形飞秒脉冲序列激光辐照金属薄膜的热行为

DOI:
10.1016/j.optcom.2010.12.089
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发表时间:
2011-04
影响因子:
2.4
通讯作者:
Jin, M. X.
Jin, M. X.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Chen, A. M.;Jiang, Y. F.;Sui, L. Z.;Ding, D. J.;Liu, H.;Jin, M. X.

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对整形飞秒脉冲序列加热金属靶的双温模型进行了数值求解。采用双温度模型对整形飞秒脉冲序列进行了分析,得到了以下主要结论。我们证实了不同形状的飞秒脉冲序列的明显不同的结果。随着整形飞秒脉冲数目的增加,电子与声子之间的非平衡态逐渐消失,最高瞬态电子温度降低,热分解时间延长,由于孵化对电子温度的影响,电子热导率保持较高,保持了超短激光的优势。成形飞秒脉冲序列可以提高烧蚀和微加工的效率。
A numerical solution of the two-temperature model has been performed up to the shaped femtosecond pulse sequences heated metal target. The two-temperature model is used to analyze the shaped femtosecond pulse sequences with the following major conclusions. We confirm the distinctly different results on the different shaped femtosecond pulse sequences. As the number of shaped femtosecond pulses increases, the nonequilibrium state between electrons and phonons gradually disappears, the highest transient electron temperature is lowered and the thermolization time is prolonged, the electron heat conductivity remains higher because of the effect of incubation on the electron temperature, which preserves the advantages of ultrashort lasers. The shaped femtosecond pulse sequences can increase the efficiency in ablation and micromachining.
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