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Proceedings Paper

Novel immersion grating, VPH grating, and quasi-Bragg grating
Author(s): Noboru Ebizuka; Keiko Oka; Akiko Yamada; Masako Kashiwagi; Kashiko Kodate; Koji S. Kawabata; Mariko Uehara; Chie Nagashima; Kotaro Ichiyama; Takashi Ichikawa; Tomoyuki Shimizu; Shinya Morita; Yutaka Yamagata; Hitoshi Omori; Hitoshi Tokoro; Yasuhiro Hirahara; Shuji Sato; Masanori Iye
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Paper Abstract

We have successfully fabricated germanium immersion gratings with resolving power of 45,000 at 10 μm by using a nano precision 3D grinding machine and ELID (ELectrolytic In-process Dressing) method. However the method spends large amount of machine times. We propose grooves shape with a new principle for a solid grating, which achieves high performance and lower cost. We have developed volume phase holographic (VPH) grisms with zinc selenide (ZnSe) prisms for spectrograph of the Subaru Telescope and the other telescopes. While a VPH grism with high index prisms achieves higher dispersion, diffraction efficiency of VPH grating decreases toward higher orders. A "quasi-Bragg grating" which inherits advantage of a VPH grating achieves high diffraction efficiency toward higher orders. Wavelength tuners with a pair of counter-rotation prisms for a VPH and quasi-Bragg grating obtain high diffraction efficiency over wide wavelength range. The novel immersion grating, VPH grism with high index prisms, quasi-Bragg grating and wavelength tuners dramatically reduce volumes of astronomical spectrographs.

Paper Details

Date Published: 6 July 2006
PDF: 8 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62732G (6 July 2006); doi: 10.1117/12.671100
Show Author Affiliations
Noboru Ebizuka, National Astronomical Observatory of Japan (Japan)
RIKEN (Japan)
Keiko Oka, Japan Women's Univ. (Japan)
RIKEN (Japan)
Akiko Yamada, Japan Women's Univ. (Japan)
Masako Kashiwagi, Japan Women's Univ. (Japan)
Kashiko Kodate, Japan Women's Univ. (Japan)
Koji S. Kawabata, Hiroshima Univ. (Japan)
National Astronomical Observatory of Japan (Japan)
Mariko Uehara, Nagoya Univ. (Japan)
Chie Nagashima, Nagoya Univ. (Japan)
Kyoto Univ. (Japan)
Kotaro Ichiyama, Tohoku Univ. (Japan)
Takashi Ichikawa, Tohoku Univ. (Japan)
Tomoyuki Shimizu, RIKEN (Japan)
Shinya Morita, RIKEN (Japan)
Yutaka Yamagata, RIKEN (Japan)
Hitoshi Omori, RIKEN (Japan)
Hitoshi Tokoro, Nagoya Univ. (Japan)
Yasuhiro Hirahara, Nagoya Univ. (Japan)
Shuji Sato, Nagoya Univ. (Japan)
Masanori Iye, National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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