不同激光参数与真空中铝的冲量耦合  

Impulse coupling to aluminum in vacuum with different laser parameters

作　　者：赵学庆[1] 刘晶儒[1] 姜宗福[2] 张建泉[1] 

机构地区：[1]西北核技术研究所,陕西西安710024 [2]国防科技大学理学院,湖南长沙410073

出　　处：《量子电子学报》2006年第2期213-216,共4页Chinese Journal of Quantum Electronics

基　　金：国防科技预研基金资助课题(00J11.4.2KG2101)

摘　　要：冲量耦合是高功率激光烧蚀材料过程中的一个重要物理现象,成为许多应用研究的物理基础,而激光对材料的冲量耦合大小直接与所采用的激光辐照参数密切相关。在真空中,冲量耦合仅由蒸发波决定,反冲压力存在时间主要取决于激光脉冲维持时间,因而冲量计算须考虑材料的非定常气化过程。利用非定常透明蒸汽模型,研究了真空条件下不同波长和不同脉宽激光与铝靶作用时的冲量耦合系数及随入射激光功率密度的变化关系,计算结果与实验结果符合较好。Laser induced impulse coupling is one of the important phenomena in laser ablation to materials and leads to many applications. The amplitude of impulse coupling coetticient is varied with laser parameters on target. As the timescale of repulse pressure is mainly determined by laser duration, laser produced impulse coupling in vacuum is only caused by vaporization contributions, so unsteady vaporization have to be considered in making some calculations on laser induced momentum. The dependence of impulse coupling coefficient to aluminum in vacuum vs. incident laser intensity with different wavelength and pulsewidth are studied by unsteady transparent vapor model. Good agreement between theoretical results and experimental measurements has been achieved.

关 键 词：激光技术 激光烧蚀 冲量耦合 非定常气化 激光参数 准分子激光 激光推进 

分 类 号：TN249[电子电信—物理电子学]