14 February 2003 Near-infrared polarimeter for the Subarau telescope
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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.
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Motohide Tamura, Motohide Tamura, Misato Fukagawa, Misato Fukagawa, Koji Murakawa, Koji Murakawa, Hiroshi Suto, Hiroshi Suto, Yoichi Itoh, Yoichi Itoh, Yoshiyuki Doi, Yoshiyuki Doi, } "Near-infrared polarimeter for the Subarau telescope", Proc. SPIE 4843, Polarimetry in Astronomy, (14 February 2003); doi: 10.1117/12.458839; https://doi.org/10.1117/12.458839
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