Near-infrared polarimeter for the Subarau telescope
Near-infrared polarimeter for the Subarau telescope
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DOI：
10.1117/12.458839
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发表时间：
2003-02
期刊：
影响因子：
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通讯作者：
M. Tamura;M. Fukagawa;K. Murakawa;H. Suto;Y. Itoh;Y. Doi
中科院分区：
文献类型：
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作者：
M. Tamura;M. Fukagawa;K. Murakawa;H. Suto;Y. Itoh;Y. Doi
本文报道了用于斯巴鲁8.2米望远镜的近红外偏振仪的研制和性能。该偏振仪目前与斯巴鲁仪器之一Ciao一起使用，Ciao是一种带有自适应光学的恒星日冕成像器。CIAO是专门用来获取明亮物体附近微弱物体的高对比度图像的仪器。为了实现高空间分辨率和高动态范围，该仪器与斯巴鲁自适应光学系统一起使用，并具有专用的冷日冕成像能力。该旋光仪包括两个部件。其中一个部件由消色差半波片、消色差四分之一波片和校准线栅组成。半波片和四分之一波片都是可旋转和可伸缩的，而校准器只能伸缩。该组件被放置在包括自适应光学系统在内的任何光学组件的上游，从而最大限度地减少了各种反射镜对仪器偏振的影响。另一个组件由两个锚定器组成，一个冷丝网和一个冷的沃拉斯特龙棱镜。这些都被放置在Ciao低温恒温器的滤轮中，可以选择。整个系统都是远程控制的。
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.