为FOCAS开发的Grisms
Grisms Developed for FOCAS
摘要：
微弱物体照相机和光谱仪（FOCAS）是一种通用的8.2米斯巴鲁望远镜的常用光学仪器，提供成像和光谱观测。FOCAS采用分辨率为280 ~ 8200的光栅作为色散光学元件。棱镜是由透射光栅和棱镜组成的直视光栅。FOCAS有五个带有复制表面浮雕光栅的光栅，包括一个中阶梯光栅，和八个带有体相位全息（VPH）光栅的光栅。这种光栅的孔径尺寸为110 mm × 106 mm，最大厚度为110 mm。我们讨论了这些FOCAS光栅的性能在实验室中测量，并验证它的测试观测，并显示天文光谱观测的例子。
英文摘要：
Faint Object Camera and Spectrograph (FOCAS) is a versatile common-use optical instrument for the 8.2m Subaru Telescope, offering imaging and spectroscopic observations. FOCAS employs grisms with resolving powers ranging from 280 to 8200 as dispersive optical elements. A grism is a direct-vision grating composed of a transmission grating and prism(s). FOCAS has five grisms with replica surface-relief gratings including an echelle-type grism, and eight grisms with volume-phase holographic (VPH) gratings. The size of these grisms is 110 mm X 106 mm in aperture with a maximum thickness of 110 mm. We employ not only the dichromated gelatin, but also the hologram resin as a recording material for VPH gratings. We discuss the performance of these FOCAS grisms measured in the laboratory, and verify it by test observations, and show examples of astronomical spectroscopic observations.
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