@inproceedings{da631d6b888040619e877f73201d9f40,
title = "Novel immersion grating, VPH grating and Quasi-Bragg grating",
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.",
keywords = "High dispersion spectroscopy, High index material, Solid grating",
author = "Noboru Ebizuka and Keiko Oka and Akiko Yamada and Masako Kashiwagi and Kashiko Kodate and Kawabata, {Koji S.} and Mariko Uehara and Chie Nagashima and Kotaro Ichiyama and Takashi Ichikawa and Tomoyuki Shimizu and Shinya Morita and Yutaka Yamagata and Hitoshi Omori and Hitoshi Tokoro and Yasuhiro Hirahara and Shuji Sato and Masanori Iye",
note = "Copyright: Copyright 2011 Elsevier B.V., All rights reserved.; Optomechanical Technologies for Astronomy ; Conference date: 24-05-2006 Through 31-05-2006",
year = "2006",
doi = "10.1117/12.671100",
language = "English",
isbn = "0819463388",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Optomechanical Technologies for Astronomy",
}