Plasma and Fusion Research

Volume 18, 1301015 (2023)

Letters

Development of Cost-Effective Polychromator System with Two Angled Filters for Thomson Scattering Measurement System
Jungkyun KIM, Shun KAMIYA, Haruka YAMAGUCHI, Hiroshi TANABE and Yasushi ONO
Graduate School of Frontier Sciences, University of Tokyo, Tokyo 113-0032, Japan
(Received 6 November 2022 / Accepted 6 February 2023 / Published 3 March 2023)

Abstract

We constructed the cost-effective polychromator system for multi-channel Thomson scattering measurement systems, in which scattered light is reflected between two angled interference filters. The number of interference filters was reduced to less than half of the number of wavelength channels, by using the reflections between two filters whose transmitted wavelength decreases with its angle of incidence. The developed polychromator successfully separated five different wavelength bands (1055.5, 1044.9, 1050.0, 1035.0, and 1024.3 nm), reducing its cost by saving the number of interference filters.

Keywords

polychromator, Thomson scattering, avalanche photodiode, interference filter, angle of incidence

DOI: 10.1585/pfr.18.1301015

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