Abstract
This article presents research work on a spectroscopic survey telescope. Our idea is as follows: for such a telescope, a pure reflecting optical system is designed, which should have an aperture and a field of view (FOV) both as large as possible and excellent image quality, and then a strip lensm (lens-prism) atmospheric dispersion corrector (S-ADC) is added, only for correcting the atmospheric dispersion. Given the fund limitation and the simplicity of scaling up, some 12-m telescopes are designed as examples. Su, Korsch, and Meinel put forward the four-mirror Nasmyth systems I and II, which are used in this paper. FOVs of 1.5°, 2°, and 2.5° are selected. For all systems, the image qualities are excellent. Because the S-ADC relaxes the optical glass size restriction, this 12-m telescope with a FOV of 2.5° can be magnified in proportion to a 16-m telescope. Its etendue (from French étendue) and focal surface will now be the largest in the world. In such a telescope, a pure reflecting optical system can also be obtained. A subsequent coudé system is designed with excellent image quality.
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This work was supported by the National Key R&D Program of China (Grant No. 2022YFA1603001). We thank Professor Gerard Lemaitre, the famous astronomer and optical scientist and one of the two pioneers of monolithic mirror active optics, for his valuable discussions, suggestions, and encouragement on this paper. We also thank Professor Ming Liang, the famous astronomical optical expert who designed the optical systems of DESI, DKIST and LSST (one of the two designers) for the USA and the work mentioned above for China, for his valuable discussions on this paper. We thank Professor Gongbo Zhao, a distinguished astrophysicist and the deputy director of NAOC, for his encouragement and support. We thank Ms. Xiaojie Jiao and Ms. Tingting Liu very much for helping us process some text.
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Su, Dq., Bai, H., Yuan, X. et al. Optical system for extremely large spectroscopic survey telescope. Sci. China Phys. Mech. Astron. 67, 279511 (2024). https://doi.org/10.1007/s11433-023-2316-3
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DOI: https://doi.org/10.1007/s11433-023-2316-3