Investigation of optical distortion self-compensation ability in the MUltiplexed Survey Telescope

Xiaodong Dai; Qi Bian; Yamin Zheng; Yifan Zhang; Haijiao Jiang; Zheng Cai; Lei Huang

doi:10.1117/12.2687270

28 November 2023 Investigation of optical distortion self-compensation ability in the MUltiplexed Survey Telescope

Xiaodong Dai, Qi Bian, Yamin Zheng, Yifan Zhang, Haijiao Jiang, Zheng Cai, Lei Huang

Author Affiliations +

Proceedings Volume 12765, Optical Design and Testing XIII; 127651I (2023) https://doi.org/10.1117/12.2687270
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

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Abstract

MUltiplexed Survey Telescope (MUST) proposed by Tsinghua University aims to build a 6.5-meter widefield telescope for the ground-based spectroscopic survey. MUST adopts the Ritchey-Chretien system with the Cassegrain focus, consisting of an active support primary mirror, a passive support secondary mirror and a multiple-element widefield corrector. In order to fulfill the needs of the widefield spectroscopic survey, the primary mirror is supported in a specific approach rather than traditional methods, which results in optical distortions in the center region of the beam. In this paper, we presented a self-compensation method using the corrector itself to compensate the optical distortion caused by the primary mirror. Based on the optical system of MUST, an optical model of the self-compensation is established, and numerical simulation is conducted to implement the optimization of the corrector and investigate the self-compensation ability. Simulation results indicate that the surface shapes of the elements inside the corrector could be evolved to realize the self-compensation through the optimization of the widefield corrector, including the materials, surface shapes and load conditions. By using the presented self-compensation method, the optical distortions are well compensated and the image quality at the focal plane could be effectively improved.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Xiaodong Dai, Qi Bian, Yamin Zheng, Yifan Zhang, Haijiao Jiang, Zheng Cai, and Lei Huang "Investigation of optical distortion self-compensation ability in the MUltiplexed Survey Telescope", Proc. SPIE 12765, Optical Design and Testing XIII, 127651I (28 November 2023); https://doi.org/10.1117/12.2687270

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