9 August 2016 Development of a near-infrared detector and a fiber-optic integral field unit for a space solar observatory SOLAR-C
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We are developing a high sensitivity and fast readout near-infrared (NIR) detector and an integral field unit (IFU) for making spectro-polarimetric observations of rapidly varying chromospheric spectrum lines, such as He I 1083 nm and Ca II 854 nm, in the next space-based solar mission SOLAR-C. We made tests of a 1.7 μm cutoff H2RG detector with the SIDECAR ASIC for the application in SOLAR-C. It’s important to verify its perfor- mance in the temperature condition around -100 °C, which is hotter than the typical temperature environment used for a NIR detector. We built a system for testing the detector between -70 °C and -140 °C. We verified linearity, read-out noise, and dark current in both the slow and fast readout modes. We found the detector has to be cooled down lower than -100 °C because of significant increase of the number of hot pixels in the hotter environment. The compact and polarization maintenance IFU was designed using fiber-optic ribbons consisting of rectangular cores which exhibit good polarization maintenance. A Silicone adhesive DC-SE9187L was used to hold the fragile fiber-optic ribbons in a metal housing. Polarization maintenance property was confirmed though polarization calibration as well as temperature control are required to suppress polarization crosstalk and to achieve the polarization accuracy in SOLAR-C.
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Yukio Katsukawa, Yukio Katsukawa, Yukiko Kamata, Yukiko Kamata, Tetsu Anan, Tetsu Anan, Hirohisa Hara, Hirohisa Hara, Yoshinori Suematsu, Yoshinori Suematsu, Takamasa Bando, Takamasa Bando, Kiyoshi Ichimoto, Kiyoshi Ichimoto, Toshifumi Shimizu, Toshifumi Shimizu, "Development of a near-infrared detector and a fiber-optic integral field unit for a space solar observatory SOLAR-C", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99045I (9 August 2016); doi: 10.1117/12.2234547; https://doi.org/10.1117/12.2234547

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