发射光谱法对早期激光诱导铝合金等离子体诊断研究
发布时间：2019-03-31 19:18
【摘要】：对激光诱导等离子体参数进行诊断有多种方法,其中采用发射光谱法对其诊断是一种重要的方法。文中采用Nd∶YAG固态激光器,输出波长1 064nm红外激光与铝合金样品相互作用,深入研究了铝合金等离子体产生早期(1μs)谱线轮廓、谱线强度、线背比、谱线半峰宽及位移等随时间演变规律。研究表明,激光与物质相互作用早期,电子数密度非常大,电子与离子及原子之间的相互作用非常强烈,谱线的Stark展宽效应非常明显,导致多重谱线重叠在一起,随时间演变,电子数密度及电子温度的降低,多重谱线的半峰宽越来越窄且谱线轮廓对称性越来越好。MgⅠ285.212 6nm谱线强度早期逐渐增强,大约100ns左右谱线强度达到最大值,然后谱线强度呈逐渐减小的趋势,这是由于等离子体产生早期,电子及离子占主导地位,故早期原子谱线强度较弱,随时间演变,电子与离子之间的复合,原子数密度逐渐增加,故原子谱线逐渐增强,达到最大值之后,由于等离子体激发温度的降低,故谱线强度逐渐减弱。以NIST波长位置为参考,等离子体产生的早期谱线发生了红移,连续背景强度随时间演变呈幂函数形式急剧递减,与之相反,谱线的连续背景强度与谱线强度相比,连续背景衰减的速度更为迅速,故导致谱线信背比随时间演变呈增大趋势,本研究对等离子体早期这些现象从理论角度进行了深入探讨。
[Abstract]:There are many methods to diagnose the parameters of laser-induced plasma, among which emission spectrometry is an important method. In this paper, Nd:YAG solid-state laser and 1 064nm infrared laser interacting with aluminum alloy samples are used to study the profile, intensity and back-to-back ratio of (1 渭 s) spectral lines in the early generation of aluminum alloy plasma. The half-peak width and displacement of spectral line evolve with time. The results show that in the early stage of laser-matter interaction, the electron number density is very large, the interaction between electrons and ions and atoms is very strong, and the Stark broadening effect of spectral lines is very obvious, which leads to the overlapping of multiple spectral lines and their evolution over time. With the decrease of electron number density and electron temperature, the half-peak width of multiple spectral lines becomes narrower and the symmetry of spectral lines becomes better and better. The intensity of Mg 鈪，
本文编号：2451200
[Abstract]:There are many methods to diagnose the parameters of laser-induced plasma, among which emission spectrometry is an important method. In this paper, Nd:YAG solid-state laser and 1 064nm infrared laser interacting with aluminum alloy samples are used to study the profile, intensity and back-to-back ratio of (1 渭 s) spectral lines in the early generation of aluminum alloy plasma. The half-peak width and displacement of spectral line evolve with time. The results show that in the early stage of laser-matter interaction, the electron number density is very large, the interaction between electrons and ions and atoms is very strong, and the Stark broadening effect of spectral lines is very obvious, which leads to the overlapping of multiple spectral lines and their evolution over time. With the decrease of electron number density and electron temperature, the half-peak width of multiple spectral lines becomes narrower and the symmetry of spectral lines becomes better and better. The intensity of Mg 鈪，
本文编号：2451200
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