Zhang Yifan, Bian Qi, Guo Liquan, Shectman Stephen, Tian Zhongtian, Huang Jinlong, Xu Chen, Cai Zheng, Huang Song, Lu Lu, Zheng Yamin, Mao Shude, Huang Lei
Appl Opt. 2024 Jun 1;63(16):4284-4292. doi: 10.1364/AO.521907.
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.
现代大型光谱巡天望远镜的发展响应了天文学研究对光谱信息的迫切需求。清华大学此前提出了一台由里奇-克莱琴结构和1.8米多镜片宽视场校正器组成的6.5米多通道巡天望远镜，实现了优异的性能和世界领先的巡天效率。然而，为了克服先前校正器设计在玻璃均匀性和制造验证方面的限制，提出了一种优化的由五个镜片组成的1.65米多镜片校正器。它保持了出色的图像质量，在高达55°天顶角的3°视场内，80%的能量集中直径不超过0.559角秒。优化后的光学系统在确保大型校正器元件制造的合理性和准确性的同时，不改变ADC的工作模式或主镜的曲率。它为后续迭代的多通道巡天望远镜以及与制造商的沟通提供了更可行的参考光学设计。
