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Design of pupil off-axis space telescope with freeform surfaces based on the nodal aberration theory
Author(s): Haodong Shi; Lingjie Wang; Chao Wang; Zhuang Liu; Guanlin Li; Huilin Jiang
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Paper Abstract

Pupil off-axis optical system has the advantages of imaging unobscured and restraining the stray light for the next generation space telescope. However, non-rotationally asymmetric aberrations lead by the pupil off-axis structure becomes the main influencing factor of imaging quality. Since the freeform surface can provide more degrees of freedom for optical design, it is widely used to control the non-rotationally asymmetric aberrations. In order to guide designer optimize the pupil off-axis optical systems with freeform surfaces efficiently, an aberration analysis method for pupil off-axis optical system with Fringe Zernike polynomial freeform surfaces is proposed. The analysis expressions of third-order astigmatism and coma of the pupil off-axis freeform system are deduced. The freeform impacts on aberration nodal properties are analyzed. According to the aberration distribution, a pupil off-axis space telescope freeform optical system is designed by optimizing the Zernike terms pointedly. The effective focal length is 25m, the pupil diameter is 2m. By stitching multi-detectors to realize the field of view (FOV) of 1.2°×1.2°. Because of introducing freeform surfaces, the third-order astigmatism and coma nodes are both moved back to the FOV. Therefore, the asymmetric aberrations lead by pupil off-axis are balanced. The final imaging quality is closed to the diffraction limit, which meets the requirements.

Paper Details

Date Published: 11 January 2019
PDF: 8 pages
Proc. SPIE 10837, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 108370G (11 January 2019); doi: 10.1117/12.2505376
Show Author Affiliations
Haodong Shi, Changchun Univ. of Science and Technology (China)
Lingjie Wang, Changchun Univ. of Science and Technology (China)
Chao Wang, Changchun Univ. of Science and Technology (China)
Zhuang Liu, Changchun Univ. of Science and Technology (China)
Guanlin Li, Changchun Univ. of Science and Technology (China)
Huilin Jiang, Changchun Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 10837:
9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes
Xiaoliang Ma; Bin Fan; Yongjian Wan; Adrian Russell; Xiangang Luo, Editor(s)

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