强激光与粒子束2017，Vol.29Issue(7)：29-33,5.DOI:10.11884/HPLPB201729.170017
光学性质对超快激光辐照下铜膜热响应的影响
Effect of optical properties on the thermal responses of copper films induced by ultrafast lasers
摘要
Abstract
The optical properties of metal targets subject to ultrafast laser irradiation are dynamically changing.A hybrid method coupling the two-temperature model with molecular dynamics has been used to simulate the femto-and pico-second laserinduced thermal responses of copper films considering the dynamic and constant optical properties.The constant optical properties include an equivalent average reflectivity calculated by setting equally deposited laser energy and an absorption coefficient at room temperature.The results show that the electron and lattice temperatures are little different in both femtosecond and picosecond laser cases,especially for the femtosecond laser with a pulse width far less than electron-lattice relaxation time.As the laser pulse width is comparable to or greater than the relaxation time,e.g.,the picosecond laser,the influence of the dynamic change of the optical properties on the melting and re-solidification of the material becomes more significant.关键词
超快激光/铜薄膜/双温模型/分子动力学/动态反射率和吸收系数Key words
ultrafast lasers/copper films/two-temperature model/molecular dynamics/dynamic reflectivity and absorption coefficient分类
信息技术与安全科学引用本文复制引用
雷春霞,任云鹏,干湧,林家坚,陈燕..光学性质对超快激光辐照下铜膜热响应的影响[J].强激光与粒子束,2017,29(7):29-33,5.基金项目
浙江省自然科学基金项目(LY17A020006) （LY17A020006）
国家自然科学基金项目(11504144) （11504144）
江苏大学高级人才引进项目(15JDG133) （15JDG133）
