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Proceedings Paper

Near-infrared polarimeter for the Subaru telescope
Author(s): Motohide Tamura; Misato Fukagawa; Koji Murakawa; Hiroshi Suto; Yoichi Itoh; Yoshiyuki Doi
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Paper Abstract

We report the development and performance of a near-IR polarimeter for the Subaru 8.2m telescope. The polarimeter is currently used with one of the Subaru instruments, CIAO, the stellar coronagraphic imager with adaptive optics. CIAO is the instrument specialized to obtain high contrast images of faint objects in the vicinity of bright objects. For achieving both high spatial resolution and high dynamic range, the instrument is used wiht the Subaru adaptive optics and has a dedicated cold coronagraphic capability. The polarimeter comprises two components. One component consists of an achromatic half-waveplate, an achromatic quarter-waveplate, and a calibration wire grid. Both half- and quarter-waveplates are rotatable and retractable, while the calibrator is only retractable. This componetn is placed upstream of any opticla components including adaptive optics system, which minimizes the effect of various mirros on instrumental polarization. The other component consists of two anlayzers, a cold wire grid and acold Wollastron prism. These are placed in the filter wheels of CIAO cryostat and can be chosen. The whole system is remotely controlled.

Paper Details

Date Published: 14 February 2003
PDF: 6 pages
Proc. SPIE 4843, Polarimetry in Astronomy, (14 February 2003); doi: 10.1117/12.458839
Show Author Affiliations
Motohide Tamura, National Astronomical Observatory of Japan (Japan)
Misato Fukagawa, Univ. of Tokyo (Japan)
Koji Murakawa, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Hiroshi Suto, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Yoichi Itoh, Kobe Univ. (Japan)
Yoshiyuki Doi, Subaru Telescope/National Astronomical Observatory of Japan (United States)

Published in SPIE Proceedings Vol. 4843:
Polarimetry in Astronomy
Silvano Fineschi, Editor(s)

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