物理参数变化对短脉冲激光激励温度场的影响  

Influence of physical parameters on ultrashort pulse laser excitation temperature field

作　　者：石云飞[1] 卢立中[1] 徐晨光[1] 徐桂东[1] 王纪俊[1] 许伯强[1] 

机构地区：[1]江苏大学理学院,江苏镇江212013

出　　处：《应用光学》2011年第4期810-816,共7页Journal of Applied Optics

基　　金：江苏省高校自然科学基础研究项目(07KJB140019)和(08KJB140003)

摘　　要：为研究多物理参数(耦合系数、电子热导率、电子热容、晶格热容)同时随温度变化对短脉冲激光辐照金属材料产生温度场分布的影响,基于双温耦合理论,建立了短脉冲激光辐照金属材料金的加热过程的有限元求解模型。在同时考虑脉冲激光的空间、时间分布和多参数同时随温度变化的情况下,得到短脉冲激光辐照金属材料金激励产生的温度场二维瞬态分布,并进一步比较了多物理参数同时随温度变化和采用室温物理参数两种情况下温度场分布的区别。数值结果表明:多物理参数同时随温度变化使电子温度和晶格温度的上升变快,最大值变大,而且使得材料中激光穿透直接辐照到的区域温度变高。Based on the two-temperature theory,a numerical model to solve the heating process in surface vicinity irradiated by ultrashort pulse laser is established to investigate the influence of temperature-dependent properties of material on temperature field in metal（Au） irradiated by ultrashort pulse laser.Taking account of the temperature-dependent properties of material which includes the electron-phonon coupling factor,electron thermal conductivity,electron heat capacity,lattice heat capacity,as well as the spatial and temporal shapes of the laser pulse,the transient temperature field irradiated by ultrashort pulse laser in metal（Au） is numerical simulated by the finite element method（FEM）.The electron and lattice transient temperature distributions in the vicinity of laser-irradiated region are obtained.Moreover,the temperature fields obtained from considering and neglecting the temperature-dependent properties of material are compared.The numerical results indicate that the temperature-dependent properties of material make the electron and lattice temperatures rise faster,the temperature maximum and the irradiated become higher.This study establishes a theory basis for stress field and ultrasound field in metal generated by femto-second laser.

关 键 词：激光技术 飞秒激光 双温模型 有限元方法 

分 类 号：TN241[电子电信—物理电子学]