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Proceedings Paper • Open Access

Novel gratings for next-generation instruments of astronomical observations
Author(s): N. Ebizuka; T. Okamoto; M. Takeda; T. Hosobata; Y. Yamagata; M. Sasaki; M. Uomoto; T. Shimatsu; S. Sato; N. Hashimoto; I. Tanaka; T. Hattori; S. Ozaki; W. Aoki

Paper Abstract

We will introduce current status of development of a birefringence volume phase holographic (B-VPH) grating, volume binary (VB) grating and reflector facet transmission (RFT) grating developing as the novel dispersive optical element for astronomical instruments for the 8.2m Subaru Telescope, for next generation 30 m class huge ground-based telescopes and for next generation large space-bone telescopes. We will also introduce a hybrid grism developed for MOIRCS (Multi-Object InfraRed Camera and Spectrograph) of the Subaru Telescope and a quasi-Bragg (QB) immersion grating. Test fabrication of B-VPH gratings with a liquid crystal (LC) of UV curable and normal LCs or a resin of visible light curable are performed. We successfully fabricated VB gratings of silicon as a mold with ridges of a high aspect ratio by means of the cycle etching process, oxidation and removal of silicon oxide. The RFT grating which is a surface-relief (SR) transmission grating with sawtooth shaped ridges of an acute vertex angle. The hybrid grism, as a prototype of the RFT grating, combines a high-index prism and SR transmission grating with sawtooth shape ridges of an acute vertex angle. The mold of the SR grating for the hybrid grism on to a work of Ni-P alloy of non-electrolysic plating successfully fabricated by using our ultra-precision machine and a single-crystal diamond bite. The QB immersion grating was fabricated by a combination of an inclined QB grating, Littrow prism and surface reflection mirror.

Paper Details

Date Published: 19 June 2017
PDF: 8 pages
Proc. SPIE 10233, Holography: Advances and Modern Trends V, 102330M (19 June 2017); doi: 10.1117/12.2264892
Show Author Affiliations
N. Ebizuka, RIKEN (Japan)
T. Okamoto, RIKEN (Japan)
M. Takeda, RIKEN (Japan)
T. Hosobata, RIKEN (Japan)
Y. Yamagata, RIKEN (Japan)
M. Sasaki, Toyota Technological Institute (Japan)
M. Uomoto, Tohoku Univ. (Japan)
T. Shimatsu, Tohoku Univ. (Japan)
S. Sato, CITIZEN Watch Co. Ltd. (Japan)
N. Hashimoto, CITIZEN Watch Co. Ltd. (Japan)
I. Tanaka, National Astronomical Observatory of Japan (Japan)
T. Hattori, National Astronomical Observatory of Japan (Japan)
S. Ozaki, National Astronomical Observatory of Japan (Japan)
W. Aoki, National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 10233:
Holography: Advances and Modern Trends V
Miroslav Hrabovský; John T. Sheridan; Antonio Fimia, Editor(s)

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