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Proceedings Paper

Transmission imaging of sodium in the vacuum ultra-violet spectral range: new application for an intense VUV source
Author(s): Hiroyuki Daido; Yoji Suzuki; Tetsuya Kawachi; Takeshi Fukuda; Toshio Nakagiri; Masanori Kaku; Shoichi Kubodera; Alexander S. Pirozhkov
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Paper Abstract

Metallic sodium (Na) was proposed as a transparent material in the vacuum ultra-violet (VUV) spectral range in 1930s and in 1960s. However no clear transmission has ever been demonstrated. In this paper we describe firstly the direct measurement of actual transmittance of a sodium samples in a spectral range longer than 115 nm which corresponds to the shortest transmission wavelength of magnesium fluoride (MgF2) windows, resulting in several tens of % transmittance of a 3 mm-thick solid sodium sample including MgF2 windows at the wavelength of ~120 nm. We also find very weak temperature dependency of the transmittance up to 150 degrees centigrade where the solid sample is melted at 97 degrees. The measured transmittance pushes us to make a simple imaging experiment illuminated by the VUV light through a 2-mm thick sodium sample, resulting in obtaining a clear image composed of 100 μm diameter tungsten mesh recorded on a two dimensional Charge Coupled Device detector. The result also opens a way to construct an optical imaging device for objects inside or through a solid or a liquid sodium medium. According to the present experiment, we can make a continuous real time transmission imaging for a liquid sodium sample if we use proper optical setup including an intense continuous VUV source or high repetition rated intense coherent source for holographic data acquisition. Such an experiment opens up a way to perform transmission imaging through or inside a sodium medium for characterization of hydrodynamic and material properties.

Paper Details

Date Published: 27 September 2013
PDF: 11 pages
Proc. SPIE 8849, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications X, 884908 (27 September 2013); doi: 10.1117/12.2022938
Show Author Affiliations
Hiroyuki Daido, Japan Atomic Energy Agency (Japan)
Yoji Suzuki, Japan Atomic Energy Agency (Japan)
Tetsuya Kawachi, Japan Atomic Energy Agency (Japan)
Takeshi Fukuda, Osaka Univ. (Japan)
Toshio Nakagiri, Japan Atomic Energy Agency (Japan)
Masanori Kaku, Univ. of Miyazaki (Japan)
Shoichi Kubodera, Univ. of Miyazaki (Japan)
Alexander S. Pirozhkov, Japan Atomic Energy Agency (Japan)

Published in SPIE Proceedings Vol. 8849:
X-Ray Lasers and Coherent X-Ray Sources: Development and Applications X
Annie Klisnick; Carmen S. Menoni, Editor(s)

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