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, Yukiko Kamata, Tetsu Anan, Hirohisa Hara, Yoshinori Suematsu, Takamasa Bando, Kiyoshi Ichimoto, 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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