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。
The thermal behavior of single-layer Ag film or Ag/Au and Ag/Cu two-layer films irradiated by femtoseeond 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.
出处
《激光与光电子学进展》
CSCD
北大核心
2017年第5期248-253,共6页
Laser & Optoelectronics Progress
基金
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])
关键词
激光技术
飞秒激光
双层金属
电子温度
晶格温度
损伤阈值
laser technique
femtosecond laser
two-layer metal
electron temperature
lattice temperature
damage threshold
