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Proceedings Paper

Cryogenic performance of high-efficiency germanium immersion grating
Author(s): Yuki Sarugaku; Yuji Ikeda; Sayumi Kaji; Naoto Kobayashi; Takashi Sukegawa; Takayuki Arasaki; Sohei Kondo; Kenshi Nakanishi; Chikako Yasui; Hideyo Kawakita
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Paper Abstract

Immersion gratings will play important roles for infrared astronomy in the next generation. We have been developing immersion gratings with a variety of kinds of materials and have succeeded in fabricating a high-efficiency germanium (Ge) immersion grating with both a reflection coating on the grating surface and an AR coating on the entrance surface. The grating will be installed in a K-, L-, and M-bands (2-5μm) high-resolution (R=80,000) spectrograph, VINROUGE, which is a prototype for the TMT MIR instrument. In this paper, we report the preliminary results on the evaluation of the Ge immersion grating. We confirmed that the peak absolute diffraction efficiency was in the range of 70-80%, which was as expected from the design, at both room and cryogenic temperatures.

Paper Details

Date Published: 8 August 2016
PDF: 4 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 990637 (8 August 2016); doi: 10.1117/12.2233626
Show Author Affiliations
Yuki Sarugaku, The Univ. of Tokyo (Japan)
Yuji Ikeda, Kyoto Sangyo Univ. (Japan)
Photocoding (Japan)
Sayumi Kaji, Kyoto Sangyo Univ. (Japan)
Naoto Kobayashi, The Univ. of Tokyo (Japan)
Kyoto Sangyo Univ. (Japan)
Takashi Sukegawa, Canon Inc. (Japan)
Takayuki Arasaki, Photocoding (Japan)
Sohei Kondo, Photocoding (Japan)
Kenshi Nakanishi, Photocoding (Japan)
Chikako Yasui, National Astronomical Observatory of Japan (Japan)
Hideyo Kawakita, The Univ. of Tokyo (Japan)
Photocoding (Japan)


Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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