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Proceedings Paper

Development of immersion grating for mid-infrared high-dispersion spectrograph for the 8.2-m Subaru telescope
Author(s): Noboru Ebizuka; Shin-ya Morita; Tomoyuki Shimizu; Yutaka Yamagata; Hitoshi Omori; Moriaki Wakaki; Hideomi Kobayashi; Hitoshi Tokoro; Yasuhiro Hirahara
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Paper Abstract

The mid-infrared high dispersion spectrograph (IRHS; tentative name) with a resolving power of 200,000 at 10 μm is a candidate of the second-generation instrument for the 8.2m Subaru Telescope. A germanium immersion grating will be employed as a dispersing element for this instrument. Germanium immersion gratings for the prototype IRHS were successfully fabricated by using a nano precision 3D profile grinding/turning machine and ELID grinding method on diamond machining. As a result, the fabricated gratings observed to have grooves with ideal saw-tooth shape, smooth surface and acceptable wave front error of a diffraction beam at 10μm. In the present paper, we characterized the performance of the developed immersion gratings.

Paper Details

Date Published: 30 January 2003
PDF: 8 pages
Proc. SPIE 4842, Specialized Optical Developments in Astronomy, (30 January 2003); doi: 10.1117/12.457402
Show Author Affiliations
Noboru Ebizuka, RIKEN-The Institute of Physical and Chemical Research (Japan)
Shin-ya Morita, RIKEN-The Institute of Physical and Chemical Research (Japan)
Tomoyuki Shimizu, RIKEN-The Institute of Physical and Chemical Research (Japan)
Yutaka Yamagata, RIKEN-The Institute of Physical and Chemical Research (Japan)
Hitoshi Omori, RIKEN-The Institute of Physical and Chemical Research (Japan)
Moriaki Wakaki, Tokai Univ. (Japan)
Hideomi Kobayashi, Nagoya Univ. (Japan)
Hitoshi Tokoro, Nagoya Univ. (Japan)
Yasuhiro Hirahara, Nagoya Univ. (Japan)


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

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