Development of a slicer integral field unit for the existing optical spectrograph FOCAS: progress
Development of a slicer integral field unit for the existing optical spectrograph FOCAS: progress
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为现有光学光谱仪 FOCAS 开发切片机整体现场单元：进展
DOI：
10.1117/12.2054838
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Ozaki;S.;Tanaka;Y.;Hattori;T.;Mitsui;K.;Fukushima;M.;Okada;N.;Obuchi;Y.;Tsuzuki;T.;Miyazaki;S.;and Yamashita.;T.
我们正在为斯巴鲁望远镜上现有的光学光谱仪、暗物相机和光谱仪(FOCAS)开发一个带有图像切割器的积分场单元(IFU)。切片宽度为0.43弧秒，切片数为23，视场为13.5×9.89弧秒2。可以同时获得距离物场约5.7角分的天空光谱，这使得我们能够精确地减去背景。切片镜、光瞳镜和狭缝镜都是玻璃，它们的镜面都是通过抛光来制造的。我们的IFU尺寸约为200 mm×300 mm×80 mm，重量为1公斤。它与一个或两个掩模板一起安装在FOCAS的掩模存储器中，并通过使用现有的掩模交换机构插入光路中。这一概念允许我们灵活操作，如机会观察的目标。多层介质涂层的高反射率提供了IFU的高吞吐量(>；80%)。在本文中，我们将报告最终的光学布局，它的性能，以及样机工作的结果。
We are developing an integral field unit (IFU) with an image slicer for the existing optical spectrograph, Faint Object Camera And Spectrograph (FOCAS), on the Subaru Telescope. The slice width is 0.43 arcsec, the slice number is 23, and the field of view is 13.5 × 9.89 arcsec2. Sky spectrum separated by about 5.7 arcmin from an object field can be simultaneously obtained, which allows us precise background subtraction. Slice mirrors, pupil mirrors and slit mirrors are all glass, and their mirror surfaces are fabricated by polishing. Our IFU is about 200 mm × 300 mm × 80 mm in size and 1 kg in weight. It is installed into a mask storage in FOCAS along with one or two mask plates, and inserted into the optical path by using the existing mask exchange mechanism. This concept allow us flexible operation such as Targets of Opportunity observations. High reflectivity of multilayer dielectric coatings offers high throughput (>80%) of the IFU. In this paper, we will report a final optical layout, its performances, and results of prototyping works.