Diode laser absorption measurements of metastable helium in glow discharges
Diode laser absorption measurements of metastable helium in glow discharges
复制标题
辉光放电中亚稳态氦的二极管激光吸收测量
DOI：
10.1088/0963-0252/7/3/017
复制
发表时间：
1998
影响因子：
3.8
通讯作者：
C. Dejoseph
中科院分区：
文献类型：
--
作者：
M. Millard;P. Yaney;B. Ganguly;C. Dejoseph
介绍了一种精确测量平行板辉光放电中氦亚稳态粒子数密度分布的激光技术。该系统利用一个分布式布拉格反射器二极管激光器工作在1083 nm进行吸收测量的过渡氦。激光器的窄带宽（<3 MHz）允许同时测量线积分亚稳密度和气体温度。测量了正常和异常辉光放电中三线积分亚稳密度的轴向和径向分布。在2和5托的静态气压下使用从（正常辉光）到（异常辉光）的电流密度。阿贝尔反演的数据提供了一个空间分布的亚稳密度，显示了一个区域，具有近一维字符。在等离子体中的峰值三重态亚稳密度的位置从负辉光发射的峰值向阳极移位。三重态亚稳密度的轴向分布给出的值从8到，分别为电流密度。
A laser-based technique for accurate measurement of the population density profiles of the helium metastable in a parallel-plate, glow discharge is described. The system utilizes a distributed-Bragg-reflector diode laser operating at 1083 nm to perform absorption measurements on the transitions of helium. The narrow bandwidth (<3 MHz) of the laser permits simultaneous measurement of the line-integrated metastable density and gas temperature. Axial and radial distributions of the triplet line-integrated metastable density were measured in normal and abnormal glow discharges. Current densities ranging from (normal glow) to (abnormal glow) were used at static gas pressures of 2 and 5 Torr. Abel inversion of the data provided a spatial distribution of the metastable density that shows a region that has near one-dimensional character. The location of the peak triplet metastable density in the plasma was displaced from the peak of the negative glow emission towards the anode. Axial profiles of triplet metastable density gave values from to for current densities of 8 to , respectively.