激光技术2017，Vol.41Issue(6)：831-835,5.DOI:10.7510/jgjs.issn.1001-3806.2017.06.013
CO2激光诱导空气等离子体放电通道特性研究
Characteristics of discharge channels of air plasma induced by CO2 laser
李凤舞 1左都罗 1王新兵1
作者信息
- 1. 华中科技大学武汉光电国家实验室,武汉430074
- 折叠
摘要
Abstract
In order to study characteristics of discharge channels of air plasma induced by high -energy pulsed CO2 laser, a charging and discharging experimental setup of high voltage capacitor was established , in which the pulsed laser beam was focused by a parabolic reflector to trigger the plasma channel in the adjustable gap between a disk -like electrode and a needle-like electrode.Based on the measurements of electric parameters and emission spectra , the characteristics on start-up, impedance and plasma density of the discharge channel were analyzed.It is found that the start-up time become much shorter benefited from the high pulsed-energy and coaxial structure of laser beam and discharge direction , for a plasma channel with length of 50mm, the start-up time of the discharge was only about 2μs; the discharge channel has rather low impedance of 1Ω~2Ω, and this impedance has a decreasing tendency with the increasing of discharge voltage , which has no significant correlation with the length of plasma channel; the electron density after the laser-induced breakdown and before the electric discharge is on the level of 1019 cm-3 calculated from the Stark broadening of the emission lines , though the emission become much stronger after the startup of electric discharge , the plasma density keeps decreasing.These results will be helpful for the application of laser-induced plasma channel.关键词
激光技术/等离子体通道/等离子体阻抗/等离子体密度Key words
laser technique/plasma channel/plasma impedance/plasma density分类
数理科学引用本文复制引用
李凤舞,左都罗,王新兵..CO2激光诱导空气等离子体放电通道特性研究[J].激光技术,2017,41(6):831-835,5.
