激光与光电子学进展, 2015, 52 (4): 041406, 网络出版: 2015-04-02
分子动力学模拟飞秒激光烧蚀CuZr非晶合金的机理 下载: 1233次
Mechanism of Femtosecond Laser Ablating CuZr Amorphous Alloy
激光技术 飞秒激光 烧蚀机理 分子动力学 非晶合金 laser technique femtosecond laser ablation mechanism molecular dynamics amorphous alloy
摘要
采用结合双温方程的分子动力学方法,数值模拟脉宽为200 fs,能量密度为30~45 mJ/cm2 的超快激光与CuZr非晶合金的相互作用过程。模拟结果表明:超快激光作用下CuZr 非晶材料中原子加热速度比普通晶态金属慢得多;作用过程内部应力的演化表现为首先产生拉应力;并且随着温度与应力的演化,靶材内部产生空泡,空泡的平均大小和数目都与能量密度直接相关;靶材的烧蚀机制表现为机械破损,且烧蚀深度随着能量密度增大而增加。研究结果有助于更深入地理解飞秒激光与非晶合金相互作用机理。
Abstract
Femtosecond (fs) laser ablating CuZr amorphous alloy is investigated with molecular dynamics (MD) simulation combined with two temperature models. The duration of laser pulse is 200 fs and the fluence is regulated from 30 mJ/cm2 to 45 mJ/cm2. The results indicate that thermal diffusion of CuZr glass metal is much more slowly as compared with crystalline metal; tensile stresses is observed in target at first;the average size and the number of the gas bubbles generate inside the target are strongly dependent on the laser fluence; photomechanical effects are the main ablation mechanism,and ablation depth increases with fluence. It is helpful to understand the mechanism of interaction between femtosecond laser and amorphous alloy.
陈冰, 朱卫华, 陈鹏, 陈志勇, 郭玮, 王新林. 分子动力学模拟飞秒激光烧蚀CuZr非晶合金的机理[J]. 激光与光电子学进展, 2015, 52(4): 041406. Chen Bing, Zhu Weihua, Chen Peng, Chen Zhiyong, Guo Wei, Wang Xinlin. Mechanism of Femtosecond Laser Ablating CuZr Amorphous Alloy[J]. Laser & Optoelectronics Progress, 2015, 52(4): 041406.