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Laser absorption measurements of the helium triplet metastable in an electrical discharge using a distributed-Bragg reflecting diode laser.

机译：使用分布式布拉格反射二极管激光器对放电中的亚稳态氦三重态的激光吸收测量。

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摘要

A tunable, distributed-Bragg reflector diode laser operating in the 1083 nm region was used to measure several properties of the 23 S1 helium metastable in a simple dc and pulsed dc electrical discharge by absorption spectroscopy. Among these were the spatial variation of the metastable density, the dependence of the density on the applied current, the diffusion of the metastables in the discharge and the role of the higher-order diffusion terms in the observed density decay following pulsed excitation. The spatial distribution of the metastables was measured in a dc, wall-less, parallel-plate discharge with capped electrodes at 1, 3 and 5 Torr total gas pressure. The discharge was run in the normal (8 muA-cm-2) to abnormal (175 muA-cm-2) glow regimes. Abel inversion of the data provided a spatial distribution of the 23 S1 metastable density that shows a region that has near one-dimensional character. The axial metastable density ranged from 5 x 109--1.2 x 1011cm-3 for current densities of 8--175 muA-cm-2, respectively. Measurements of the decay of the metastables due to diffusion was carried out in a pulsed-dc, walled, parallel-plate discharge at 2 and 5 Torr total gas pressure. The measured value derived from this work was 471 +/- 22cm2-sec-1 by fitting to the long-time decay data. Also found in the pulsed discharge was evidence of higher-order diffusion modes. An analytical model of the higher-order modes was used to quantify their effects. To the best of our knowledge, this is the first reported measurement of these modes. The diffusion coefficient measured in this way was found to be 471 +/- 15 cm2-sec-1.
机译：使用在1083 nm范围内工作的可调分布式布拉格反射镜二极管激光器，通过吸收光谱法测量了在简单的直流和脉冲直流放电中亚稳23 S1氦的几种性质。其中包括亚稳态密度的空间变化，密度对施加电流的依赖性，放电中亚稳态的扩散以及高阶扩散项在脉冲激发后观测到的密度衰减中的作用。在直流，无壁，平行板放电中，在总气压为1、3和5 Torr的情况下，用带帽电极对亚稳进行了测量。放电以正常（8μA-cm-2）到异常（175μA-cm-2）的发光状态进行。数据的Abel反演提供了23 S1亚稳密度的空间分布，该分布显示了具有近一维特征的区域。对于8--175μA-cm-2的电流密度，轴向亚稳密度范围为5 x 109--1.2 x 1011cm-3。在总气压为2 Torr和5 Torr的情况下，在脉冲直流，壁式，平行板放电中对由于扩散引起的亚稳态衰减进行测量。通过拟合长期衰减数据，从这项工作得出的测量值为471 +/- 22cm2-sec-1。在脉冲放电中还发现了高阶扩散模式的证据。高阶模式的分析模型用于量化其影响。据我们所知，这是这些模式的首次报告测量。发现以此方式测量的扩散系数为471 +/- 15cm 2 -sec-1。

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  • 作者

    Millard, Michael Wayne.;

  • 作者单位

    University of Dayton.;

  • 授予单位 University of Dayton.;
  • 学科 Engineering Electronics and Electrical.;Physics Fluid and Plasma.;Physics Optics.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 185 p.
  • 总页数 185
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 人类学;
  • 关键词

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