The optical design and physical optics analysis of a cross-Dragonian telescope for LiteBIRD

Hiroaki Imada; Tadayasu Dotani; Takashi Hasebe; Masashi Hazumi; Junji Inatani; Hirokazu Ishino; Shingo Kashima; Nobuhiko Katayama; Kimihiro Kimura; Tomotake Matsumura; Ryo Nagata; Yutaro Sekimoto; Hajime Sugai; Aritoki Suzuki; Shin Utsunomiya

doi:10.1117/12.2312185

16 July 2018 The optical design and physical optics analysis of a cross-Dragonian telescope for LiteBIRD

Hiroaki Imada, Tadayasu Dotani, Takashi Hasebe, Masashi Hazumi, Junji Inatani, Hirokazu Ishino, Shingo Kashima, Nobuhiko Katayama, Kimihiro Kimura, Tomotake Matsumura, Ryo Nagata, Yutaro Sekimoto, Hajime Sugai, Aritoki Suzuki, Shin Utsunomiya

Author Affiliations +

Proceedings Volume 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave; 106984K (2018) https://doi.org/10.1117/12.2312185
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The Lite satellite for the studies of B-mode polarization and Inflation from the cosmic microwave background (CMB) Radiation Detection (LiteBIRD) is a next generation CMB satellite dedicated to probing the inflationary universe. It has two telescopes, Low Frequency Telescope (LFT) and High Frequency Telescope (HFT) to cover wide observational bands from 34 GHz to 448 GHz. In this presentation, we report the optical design and characterization of the LFT. We have used the CODE-V to obtain the LFT optical design based on a cross- Dragonian telescope. It is an image-space telecentric system with an F number of 3.5 and 20 x 10 degrees² field of view. The main, near and far side lobes at far-field have been calculated by using a combination of HFSS and GRASP 10. It is revealed that the LFT telescope has good main lobe properties to satisfy the requirements. On the other hand, the side lobes are affected by the stray light that stems from the triple reflection and the direct path from feed. In order to avoid the stray light, the way to block these paths is now under study.

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Hiroaki Imada, Tadayasu Dotani, Takashi Hasebe, Masashi Hazumi, Junji Inatani, Hirokazu Ishino, Shingo Kashima, Nobuhiko Katayama, Kimihiro Kimura, Tomotake Matsumura, Ryo Nagata, Yutaro Sekimoto, Hajime Sugai, Aritoki Suzuki, and Shin Utsunomiya "The optical design and physical optics analysis of a cross-Dragonian telescope for LiteBIRD", Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106984K (16 July 2018); https://doi.org/10.1117/12.2312185

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