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Proceedings Paper

Development of the mid-IR echelle high-dispersion spectrograph employing the germanium immersion grating
Author(s): Yasuhiro Hirahara; Tsuyoshi Hirao; Yoshio Tatamitani; Tomohisa Yonezu; Noboru Ebizuka; Kentaro Kawaguchi; Hitoshi Tokoro; Tomomichi N. Oka
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Paper Abstract

We have developed a germanium immersion grating mid-infrared cryogenic spectrograph (GIGMICS) designed for the Nasmyth focus stage of NAOJ Subaru 8.2 m telescope, which operates at N-band (8-13 μm) in wavelength with the R ~ 50,000. A single crystal germanium immersion echelle grating (30 × 30 × 72 mm) for collimated beam size of Φ28 mm was fabricated by utilizing ultra precision micro-grinding method coupled with the ELID (ELectrolytic In-process Dressing) technique (Ohmori, H. 1992)1. All optical components are arranged on the 800 mm diameter cold optical base plate (~30 K) of the cryostat. By the Si:As IBC (Impurity Band Conductor) focal plane array (FPA) detector (412 × 512 pixels, unit pixel size 30 μm) operated at 5 K simultaneously acquires ~13 % wavelength coverage for N-band. The instrument has been assembled and is now tested for the application to the gas-phase IR high-resolution spectroscopy.

Paper Details

Date Published: 15 July 2010
PDF: 10 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77351B (15 July 2010); doi: 10.1117/12.856624
Show Author Affiliations
Yasuhiro Hirahara, Nagoya Univ. (Japan)
Tsuyoshi Hirao, Nagoya Univ. (Japan)
Yoshio Tatamitani, Nagoya Univ. (Japan)
Tomohisa Yonezu, Nagoya Univ. (Japan)
Noboru Ebizuka, Nagoya Univ. (Japan)
Kentaro Kawaguchi, Okayama Univ. (Japan)
Hitoshi Tokoro, Nagoya Univ. (Japan)
Tomomichi N. Oka, Nagoya Univ. (Japan)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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