Plasma and Fusion Research

Volume 10, 3406063 (2015)

Regular Articles

Spatially Resolved Absorption Spectroscopy on a Microhollow Cathode Helium Plasma Using a Vertical-Cavity Surface-Emitting Laser
Kakeru TORII, Shota YAMAWAKI, Koichi KATAYAMA, Shinichi NAMBA1), Keisuke FUJII, Taiichi SHIKAMA and Masahiro HASUO
Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8540, Japan
1)
Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
(Received 25 November 2014 / Accepted 16 February 2015 / Published 26 May 2015)

Abstract

For the 1s2p(1P) → 1s3d(1D) transition at 667.815 nm of helium in a microhollow cathode plasma with a 300 µm diameter, we measured the absorption spectra with spatial resolution of 30 µm using a vertical-cavity surface-emitting laser diode. The spectra observed near the electrode at 10 kPa gas pressure showed asymmetry. By analyzing the observed spectra with Voigt functions including the DC Stark effect, we evaluated the gas temperature, electron density, electric field strength and 1s2p(1P) atom density and produced their two-dimensional maps.

Keywords

helium absorption spectra, laser spectroscopy, vertical-cavity surface-emitting laser, microhollow cathode plasma, spatially resolved measurement, gas temperature, electron density, electric field

DOI: 10.1585/pfr.10.3406063

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This paper may be cited as follows:

Kakeru TORII, Shota YAMAWAKI, Koichi KATAYAMA, Shinichi NAMBA, Keisuke FUJII, Taiichi SHIKAMA and Masahiro HASUO, Plasma Fusion Res. 10, 3406063 (2015).