激光烧蚀金属元靶等离子体中电学信号的实验研究  

Experimental study on the electric signal in the laser-induced Cu target

作　　者：纪运景[1] 张平[1] 童朝霞[1] 卞保民[1] 陆建[1] 

机构地区：[1]南京理工大学信息物理与工程系,南京210094

出　　处：《原子与分子物理学报》2007年第5期977-981,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(60378003);南京理工大学理学院青年教师科研发展专项计划资金

摘　　要：将高功率脉冲激光作用于金属元靶,探测激光诱导等离子体在靶上产生的电学信号.研究了作用激光能量的差异对等离子体电信号的影响,实验结果表明随着激光能量的增加电信号脉冲幅度逐渐增大并趋于饱和.同时,将激光烧蚀过程中的靶材等效为瞬态电流源,初步建立了激光诱导等离子体等效电路模型,并将该模型应用于激光烧蚀金属靶,对靶上电信号的产生机制进行了详细讨论.A tiny Cu column was used to be the metal target to detect electric signals induced by the high-pow- er pulse laser in air. And the laser energy to effect in influencing the electric signals was studied, the experimental results show that the signal intensity increases nonlinearly with the additional voltage and the saturation appears. At the same time, during laser ablation the little metal target can be equal to an instantaneous current source, on this condition the equivalent circuit model on the laser induced plasma was developed. And the producing mechanism of the electric signals at target was discussed in detail.

关 键 词：激光等离子体 金属元靶 电学信号 等效电路模型 

分 类 号：O539[理学—等离子体物理]