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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 silver thin film and silver / gold, silver / copper double-layer metal thin films irradiated by femtosecond laser was studied by using a two-temperature model. The distributions of the corresponding electron temperature and lattice temperature with time and space were obtained. The calculation results show that the double-layer metal structure can change the lattice temperature of the top silver, and then change its damage threshold. When chrome with a larger electron-lattice coupling coefficient is chosen as the underlying silver film, the damage threshold of the top silver is further increased. This is the use of silver thin film in the visible range of femtosecond laser mirror has an important guiding significance.