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飞秒激光加热双层金属薄膜的理论研究

Theoretical Study on Femtosecond Laser Heating of Two-Layer Metal Films

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摘要

通过双温模型研究了飞秒激光照射单层银薄膜和银/金、银/铜双层金属薄膜时的热行为, 计算获得了相应电子温度和晶格温度随着时间和空间的分布。计算结果表明,双层金属结构能改变顶层银的晶格温度, 进而改变其损伤阈值。选择具有更大电子晶格耦合系数的铬作为银的底层薄膜时, 顶层银的损伤阈值得到进一步提高。这对采用银薄膜制作可见光范围内飞秒激光的反射镜具有重要的指导意义。

Abstract

The thermal behavior of single-layer Ag film or Ag/Au and Ag/Cu two-layer films irradiated by femtosecond laser is studied with the two-temperature model. The corresponding distributions of electron temperature and lattice temperature versus time and space are calculated. The results show that the two-layer metal structure can change the lattice temperature of the top Ag layer, and then change its damage threshold. When selecting chromium with a larger electron-lattice coupling coefficient as the bottom layer metal for Ag film, the damage threshold of the top Ag layer is further enhanced. These results provide important guiding significance for using Ag films to manufacture the reflective mirrors for visible femtosecond lasers.

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中图分类号:O436

DOI:10.3788/lop54.051402

所属栏目:激光器与激光光学

基金项目:国家自然科学基金(11674128,11474129,11504129)、吉林省科技发展计划项目(20170101063JC)、吉林省教育厅科学研究计划项目(2016[400])

收稿日期:2016-12-18

修改稿日期:2016-12-28

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作者单位    点击查看

陈安民:吉林大学原子与分子物理研究所, 吉林 长春 130012吉林大学吉林省应用原子分子光谱重点实验室, 吉林 长春 130012
何喜明:长春师凯科技产业有限责任公司, 吉林 长春 130012
费德厚:吉林大学原子与分子物理研究所, 吉林 长春 130012吉林大学吉林省应用原子分子光谱重点实验室, 吉林 长春 130012
金明星:吉林大学原子与分子物理研究所, 吉林 长春 130012吉林大学吉林省应用原子分子光谱重点实验室, 吉林 长春 130012

联系人作者:陈安民(amchen@jlu.edu.cn)

备注:陈安民(1979-), 男, 博士, 副教授, 主要从事强激光与原子分子相互作用的研究。

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引用该论文

Chen Anmin,He Ximing,Fei Dehou,Jin Mingxing. Theoretical Study on Femtosecond Laser Heating of Two-Layer Metal Films[J]. Laser & Optoelectronics Progress, 2017, 54(5): 051402

陈安民,何喜明,费德厚,金明星. 飞秒激光加热双层金属薄膜的理论研究[J]. 激光与光电子学进展, 2017, 54(5): 051402

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