Optimized optical system with a 1.65  m wide-field corrector for the 6.5  m high-performance MUltiplexed Survey Telescope.

Applied optics Pub Date : 2024-06-01 DOI:10.1364/AO.521907
Yifan Zhang, Qi Bian, Liquan Guo, Stephen Shectman, Zhongtian Tian, Jinlong Huang, Chen Xu, Zheng Cai, Song Huang, Lu Lu, Yamin Zheng, Shude Mao, Lei Huang
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Abstract

The development of modern large-scale spectroscopic survey telescopes responds to the urgent demand for spectral information in astronomical research. Tsinghua University has previously proposed a 6.5 m MUltiplexed Survey Telescope consisting of a Ritchey-Chretien configuration and a 1.8 m multi-element wide-field corrector, achieving excellent performance and world-leading survey efficiency. However, an optimized 1.65 m multi-element corrector with five lenses is proposed to overcome the constraints on glass uniformity and verification in fabrication of the previous corrector design. It maintains outstanding image quality, with the 80% enclosed energy diameter not more than 0.559 arcsec within 3° FoV over up to a 55° zenith angle. The optimized optical system does not revise the working mode of the ADC or the curvature of the primary mirror while ensuring the reasonability and accuracy of manufacturing of large corrector elements. It provides a more feasible reference optical design for the MUltiplexed Survey Telescope in subsequent iterations and communications with manufacturers.

优化光学系统,为 6.5 米高性能 MUltiplexed 巡天望远镜配备 1.65 米宽视场校正器。
现代大型光谱巡天望远镜的发展顺应了天文研究对光谱信息的迫切需求。此前,清华大学提出的 6.5 米多元素巡天望远镜,由 Ritchey-Chretien 构造和 1.8 米多元素宽视场校正器组成,性能优异,巡天效率世界领先。然而,为了克服以前的校正器设计在玻璃均匀性和制造验证方面的限制,我们提出了一个优化的 1.65 米多元素校正器,配备五个透镜。它保持了出色的图像质量,在天顶角 55°的 3° FoV 范围内,80% 的封闭能量直径不超过 0.559 弧秒。优化后的光学系统没有改变 ADC 的工作模式或主镜的曲率,同时确保了大型校正元件制造的合理性和准确性。它为双工巡天望远镜的后续迭代和与制造商的沟通提供了一个更加可行的参考光学设计。
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