Near-infrared polarimeter for the Subaru telescope

被引：16

作者：

Tamura, M ^{[1
]}

Fukagawa, M ^{[1
]}

Murakawa, K ^{[1
]}

Suto, H ^{[1
]}

Itoh, Y ^{[1
]}

Doi, Y ^{[1
]}

机构：

[1] Natl Astron Observ, Mitaka, Tokyo 1818588, Japan

来源：

POLARIMETRY IN ASTRONOMY | 2003年 / 4843卷

关键词：

infrared; polarimetry; coronagraph; adaptive optics; Subaru telescope;

D O I：

10.1117/12.458839

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the development and performance of a near-infrared polarimeter for the Subaru 8.2-m 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 with the Subaru adaptive optics and has a dedicated cold coronagraphic capability. The polarimeter comprises two components. One component consists of an achromatic (1 - 2.5 micron) 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 component is placed upstream of any optical components including adaptive optics system, which minimizes the effect of various mirrors on instrumental polarization. The other component consists of two analyzers, a cold wire grid and a cold Wollaston prism. These are placed in the filter wheels of CIAO cryostat and can be chosen. The whole system is remotely controlled. The instrument has been commissioned on the Subaru telescope and its linear-polarization performance has been tested with/without the adaptive optics.

引用

页码：190 / 195

页数：6

共 10 条

[1] Adaptive optics 0''.2 resolution infrared images of HL Tauri: Direct images of an active accretion disk around a protostar [J].