Design and fabrication of the double Kösters prism for NIR telescope of HiZ-GUNDAM satellite

Koji S. Kawabata; Kohji Tsumura; Daisuke Yonetoku; Hideo Matsuhara; Shuji Matsuura; Akihiro Doi; Hiroshi Akitaya; Tomoya Hori

doi:10.1117/12.3016203

23 August 2024 Design and fabrication of the double Kösters prism for NIR telescope of HiZ-GUNDAM satellite

Koji S. Kawabata, Kohji Tsumura, Daisuke Yonetoku, Hideo Matsuhara, Shuji Matsuura, Akihiro Doi, Hiroshi Akitaya, Tomoya Hori

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 130926Z (2024) https://doi.org/10.1117/12.3016203
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

In 2022-23, a conceptual change of the optical train around the focus of the infrared telescope of HiZ-GUNDAM project has been developed: a double Kösters prism is newly introduced as a key optical component to divide the incident near-infrared beam (0.9-2.5um) into four wave-bands, enabling to focus four band images simultaneously onto a 1k×1k MCT sensor array. It reduces the total cost compared with the previous design where three 1k×1k MCT sensors were to be used. The prism consists of four pieces of triangular columns made of anhydrous fused silica glued on the base plate made of fused silica. We carefully selected the glue which is durable against the vibration during launch as well as the harmful environment onboard (heat shock, irradiation, vacuum). We will show its design, simple simulation of structure/vibration analysis and the status of the fabrication of the double Kösters prism.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Koji S. Kawabata, Kohji Tsumura, Daisuke Yonetoku, Hideo Matsuhara, Shuji Matsuura, Akihiro Doi, Hiroshi Akitaya, and Tomoya Hori "Design and fabrication of the double Kösters prism for NIR telescope of HiZ-GUNDAM satellite", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 130926Z (23 August 2024); https://doi.org/10.1117/12.3016203

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