飞秒
烧蚀
激光器
激发态
辐照
钻石
材料科学
激发
等离子体
电子
激光烧蚀
单晶
分子物理学
原子物理学
化学
光学
物理
结晶学
核物理学
复合材料
航空航天工程
工程类
量子力学
作者
Jinhua Yin,Genyu Chen,Zhichao Zhu,Mengqi Jin,Bin Hu
标识
DOI:10.1016/j.diamond.2020.108173
摘要
Femtosecond laser has proved to be a promising approach for single crystal diamond (SCD) processing, but the interaction mechanism between femtosecond laser and SCD is not well understood and need further theoretical investigation. In this paper, the simple rate equation was utilized to analyze the free electron excitation and evolution process and the temporal evolution of free electron density was simulated. In order to reveal the thermal interaction between electron and lattice subsystem of ablated SCD, the improved two temperature model which takes the variation of optical properties of the SCD surface caused by the excited plasma into account has been built up. The laser ablation threshold of SCD was also predicted under two theoretical models respectively. According to the single pulse ablation experiments, the simulated ablation thresholds of SCD are basically in agreement with the experimental results.
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