A Cost-Effective Polychromator with a Single Interference Filter for Thomson Scattering Diagnostics

We propose a cost-effective polychromator with a single interference filter, because interference filters account for large parts of polychromator costs in the conventional Thomson scattering diagnostics with a Nd:YAG laser. Since the interference filters are used to transmit the scattered light in...

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Bibliographic Details
Published inJournal of fusion energy Vol. 42; no. 2; p. 32
Main Authors Kamiya, Shun, Yamaguchi, Haruka, Kim, Jungkyun, Himeno, Shun-ichi, Tanabe, Hiroshi, Ono, Yasushi
Format Journal Article
LanguageEnglish
Published New York Springer US 03.08.2023
Springer Nature B.V
Subjects
Bandwidths
Channels
Electromagnetic wave filters
Electrons
Energy Systems
Incidence angle
Interference
Lasers
Light
Mirrors
Neodymium lasers
Nuclear Energy
Nuclear Fusion
Physics
Physics and Astronomy
Plasma
Plasma Physics
Semiconductor lasers
Sustainable Development
Thomson scattering
YAG lasers
Polychromator
Thomson scattering
Interference filter
Angle of incidence
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Summary:We propose a cost-effective polychromator with a single interference filter, because interference filters account for large parts of polychromator costs in the conventional Thomson scattering diagnostics with a Nd:YAG laser. Since the interference filters are used to transmit the scattered light in a specific wavelength range, one polychromator tends to have as many interference filters as its spectral channels, which makes high-resolution measurement with a number of polychromators expensive. However, we can save the number of interference filters and thus their costs by reentering reflected light from an interference filter into the same filter at different angles. This is possible, because the larger angle of incidence on the interference filter makes the wavelength of the transmitted light shorter. We measured dependence of transmitted wavelengths on the angles of incidence on one interference filter custom-ordered to transmit 1059 nm and developed the cost-effective polychromator using this dependence. The developed polychromator with a single filter successfully separated three different spectral channels (1043.2, 1051.9, and 1058.4 nm), enabling us to realize the cost-effective Thomson scattering diagnostics.
ISSN:1572-9591
0164-0313
1572-9591
DOI:10.1007/s10894-023-00371-x