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Proceedings Paper

Design and status of an optical and near-infrared spectrometer for the IRSF 1.4m Telescope
Author(s): Takahiro Nagayama; Mikio Kurita; Masaru Kino; Daisuke Mori; Takuma Kokusho
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Paper Abstract

We present our new optical and near-infrared (NIR) spectrometer for the IRSF 1.4m telescope. The concept of it is an effective use of photons, and so we have designed it to obtain a spectrum of the 0.4-2.5μm range simultaneously and have a small number of optical surfaces in order to reduce reflection loss. Light collected by the telescope is separated into optical (0.45-0.90μm) and NIR (1.0-2.5μm) wavelengths by a dichroic entrance window, and two spectrometers are prepared, one for the optical wavelengths and another for the NIR. We use a sapphire prism in the NIR spectrometer, and a diffraction grating in the optical spectrometer. The optical design is very simple and the number of optical surfaces is 9 for optical and 10 for NIR (not including the telescope mirrors). A 1024×250 pixels CCD (optical) and a 1024×1024 HgCdTe detector array (NIR) are used. The spectral resolution will be 470@0.70μm and 380@1.8μm with a 1” slit width. A NIR slit viewer with a 3’.5 × 3’.5 field of view is also mounted. The development of the spectrometer will be complete by March 2013.

Paper Details

Date Published: 24 September 2012
PDF: 7 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844671 (24 September 2012); doi: 10.1117/12.926029
Show Author Affiliations
Takahiro Nagayama, Nagoya Univ. (Japan)
Mikio Kurita, Kyoto Univ. (Japan)
Masaru Kino, Nagoya Univ. (Japan)
Daisuke Mori, Nagoya Univ. (Japan)
Takuma Kokusho, Nagoya Univ. (Japan)

Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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