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Proceedings Paper

Optical system of the 12-26 micron instrument (MIR-L) for ASTRO-F
Author(s): Naofumi Fujishiro; Hideo Matsuhara; Yuji Ikeda; Tomoyasu Yamamuro; Norihide Takeyama; Takashi Onaka; Hirokazu Kataza; Takehiko Wada; Kazunori Uemizu; Itsuki Sakon; Chiaki Ihara; Daisuke Ishihara; Woojung Kim; Munetaka Ueno; Hidenori Watarai; Hiroshi Murakami
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Paper Abstract

The MIR-L is the mid-IR (12-26 μm) instrument for Japanese infrared astronomical satellite, the ASTRO-F. The instrument has 2 observing modes: a wide field imaging mode with a field of view of 10.7 × 10.2 arcmin2 and a low resolution spectroscopic mode with a spectral resolution R = λ/Δλ about 20. The spectroscopic mode provides with not only slit-spectroscopy for extended sources but also slitless-spectroscopy for point sources. We describe here the design, manufacturing, and performance evaluation of the cryogenic optical system of the MIR-L. The concept of the optical system design is to realize wide field observations with a compact size. The instrument employs a refractive optics of 5 lenses (CsI - CsI - KRS-5 - CsI - KRS-5) with a 256×256 pixel Si:As IBC array detector, 3 filters, and 2 grisms. The refractive indices of CsI and KRS-5 at the operating temperature of about 6 K have ambiguities because of the difficulty of the measurements. We therefore designed the MIR-L optics with tolerances for the uncertainties of the indices. Since both CsI and KRS-5 have the fragility and the large thermal expansion, we designed a specialized mounting architecture to prevent from making damages and/or decentrations of the lenses at cryogenic temperatures under the serious vibration during the launch. As a result, the optical system of the MIR-L has passed both vibration and thermal cycle tests without damage and performance degradation, and achieved diffraction limited performance over its full wavelength range at the operating temperature.

Paper Details

Date Published: 18 August 2005
PDF: 12 pages
Proc. SPIE 5904, Cryogenic Optical Systems and Instruments XI, 59040I (18 August 2005); doi: 10.1117/12.614503
Show Author Affiliations
Naofumi Fujishiro, Japan Aerospace Exploration Agency (Japan)
Univ. of Tokyo (Japan)
Hideo Matsuhara, Japan Aerospace Exploration Agency (Japan)
Yuji Ikeda, Genesia Corp. (Japan)
Tomoyasu Yamamuro, Genesia Corp. (Japan)
Norihide Takeyama, Genesia Corp. (Japan)
Takashi Onaka, Univ. of Tokyo (Japan)
Hirokazu Kataza, Japan Aerospace Exploration Agency (Japan)
Takehiko Wada, Japan Aerospace Exploration Agency (Japan)
Kazunori Uemizu, Nishiharima Astronomical Observatory (Japan)
Itsuki Sakon, Univ. of Tokyo (Japan)
Chiaki Ihara, NEC Aerospace Systems (Japan)
Daisuke Ishihara, Univ. of Tokyo (Japan)
Woojung Kim, Univ. of Tokyo (Japan)
Munetaka Ueno, Univ. of Tokyo (Japan)
Hidenori Watarai, Japan Aerospace Exploration Agency (Japan)
Hiroshi Murakami, Japan Aerospace Exploration Agency (Japan)

Published in SPIE Proceedings Vol. 5904:
Cryogenic Optical Systems and Instruments XI
James B. Heaney; Lawrence G. Burriesci, Editor(s)

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