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Proceedings Paper

Development of a volume phase holographic (VPH) grism for visible to near-infrared instruments of the 8.2-m Subaru telescope
Author(s): Noboru Ebizuka; Keiko Oka; Akiko Yamada; Mami Watanabe; Kayo Shimizu; Kashiko Kodate; Masami Kawabata; Takashi Teranishi; Koji S. Kawabata; Masanori Iye
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Paper Abstract

Faint Object Camera and Spectrograph (FOCAS) is a versatile open use optical instrument of the 8.2m Subaru Telescope for the enabling imaging and spectroscopic observations. A suite of nine grisms optimized for different resolving powers and appropriate wavelength ranges have been planned for this instrument. Five grisms among the nine were fabricated by a replication method and four additional grisms with the resolving power of 5,000 are under fabrication using the volume phase holographic (VPH) gratings. A very high dispersion Echelle grism with the resolving power over 10,000 is also developing with a VPH grating sandwiched between two high index prisms. The high dispersion VPH grisms are 110 by 106 mm in aperture size and 110 mm in maximum thickness. We employed a photosensitive resin as the recording material for a thick VPH grating. In the present paper, we report the result of evaluation of the diffraction efficiency of the replica grisms and the VPH gratings by means of the rigorous coupled-wave analysis (RCWA) method to derive the optimum design parameters. An optimized VPH grating with a size of 50 by 50 mm was experimentally fabricated by means of a two-wave interference exposure at 532nm. The measured diffraction efficiency of this VPH grating is 88% at 400nm. We performed spectroscopic observations of Leonid meteors by using an image intensified CCD video camera and an experimentally fabricated VPH grism as an objective dispersion element at Nobeyama, National Astronomical Observatory of Japan in November, 2001. Consequently, we successfully obtained numerous high-quality spectroscopic data of meteors.

Paper Details

Date Published: 30 January 2003
PDF: 10 pages
Proc. SPIE 4842, Specialized Optical Developments in Astronomy, (30 January 2003); doi: 10.1117/12.458041
Show Author Affiliations
Noboru Ebizuka, RIKEN-The Institute of Physical and Chemical Research (Japan)
Keiko Oka, Japan Women's Univ. (Japan)
Akiko Yamada, Japan Women's Univ. (Japan)
Mami Watanabe, RIKEN-The Institute of Physical and Chemical Research (Japan)
Kayo Shimizu, Japan Women's Univ. (Japan)
Kashiko Kodate, Japan Women's Univ. (Japan)
Masami Kawabata, Nippon Paint Co., Ltd. (Japan)
Takashi Teranishi, Nippon Paint Co., Ltd. (Japan)
Koji S. Kawabata, National Astronomical Observatory of Japan (Japan)
Masanori Iye, National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 4842:
Specialized Optical Developments in Astronomy
Eli Atad-Ettedgui; Sandro D'Odorico, Editor(s)

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