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 m J/cm2的超快激光与Cu Zr非晶合金的相互作用过程。模拟结果表明：超快激光作用下Cu Zr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。
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/cm^2 to 45 mJ/cm^2. 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.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第4期123-127,共5页
Laser & Optoelectronics Progress
基金
湖南省自然科学基金(2012JJ6098)
湖南省研究生科研创新项目(CX2014B398)
关键词
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
