ULTIMATE-Subaru: adaptive secondary mirror development status

Shin Oya; Yosuke Minowa; Hirofumi Okita; Yoshito H. Ono; Hideki Takami

doi:10.1117/12.3018673

27 August 2024 ULTIMATE-Subaru: adaptive secondary mirror development status

Shin Oya, Yosuke Minowa, Hirofumi Okita, Yoshito H. Ono, Hideki Takami

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130975I (2024) https://doi.org/10.1117/12.3018673
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

ULTIMATE-Subaru is an on-going project at the Subaru Telescope for the next-generation wide-field infrared astronomy with adaptive optics (AO). The adaptive secondary mirror (ASM) is an important subsystem to provide improved seeing by ground-layer AO for a new infrared instrument equipped with a wide-field camera and a multi-object spectrograph. The ASM is suitable for the correction of the ground-layer of the atmospheric turbulence because the secondary mirror of the telescope is conjugated close to the ground level without any additional optics. The correction of the ground-layer turbulence near the telescope aperture improves the seeing over a wide field-of-view, because the ground-layer is common for wide range of direction on the sky and the dominant component of the total seeing. However, the performance does not reach the diffraction-limit due to the residual uncorrected upper atmospheric turbulence. The ASM is carefully designed to replace the existing non-adaptive infrared secondary mirror of the Subaru telescope, with the minimum modification on the telescope and little impact on the existing instruments. In this paper, we will present the current status of the development of the Subaru ASM.

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

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Shin Oya, Yosuke Minowa, Hirofumi Okita, Yoshito H. Ono, and Hideki Takami "ULTIMATE-Subaru: adaptive secondary mirror development status", Proc. SPIE 13097, Adaptive Optics Systems IX, 130975I (27 August 2024); https://doi.org/10.1117/12.3018673

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