激光烧蚀金属靶时气体电离分析

Spectro-Analysis of Gas Breakdown in Laser-induced Plasma During Laser Ablating Metal

我们使用Nd :YAG激光器烧蚀金属Al靶获得等离子体 ,利用光谱时 -空分辨技术 ,关于环境气体分解及其对等离子体辐射特征的影响进行了研究。使用的气体是Ar、Air、N2 。结果发现 ,在等离子体形成初期 ,等离子体时 -空分辨谱中有大量的环境气体离子谱线。基于Al等离子体不同激光能量下的时间-空间分辨谱 ,对激光烧蚀金属靶时气体电离现象进行了分析 ,对气体分解造成的影响进行了简单的讨论。

We obtained laser induced plasma by laser ablating aluminium with an Nd:YAG laser,using time and space resolved spectroscopy,the effects of ambient gas breakdown on the emission characteristics of laser induced plasma were studied.Argon,air,nitrogen were used as surrounding atmospheres.The experimental results showed that at the early stage of the plasma, there were many Ar + lines in the plasma produced in argon;O +、N + in the plasma produced in air;and N + in the plasma produced in N 2. Based on the time and space resolved emission spectra of the plasma at different laser beam energy,gas breakdown phenomena were analyzed when the alumininium was ablazed by laser.The effects of gas breakdown were briefly discussed.