Freeform surface compensation design for machining error of primary mirror

Cheng Huang; Yongjun Xie; Xianglong Mao

doi:10.1117/12.2666802

4 April 2023 Freeform surface compensation design for machining error of primary mirror

Cheng Huang, Yongjun Xie, Xianglong Mao

Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 1261775 (2023) https://doi.org/10.1117/12.2666802
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China

Abstract

Considering the demand of high-resolution imaging and dark targets detection, large-aperture space telescopes have always been the most direct tool for human observation of the universe. However, limited by the capability of current optical manufacturing equipment, the difficulty, cycle and cost of fabricating the primary mirror increase significantly as the optical surface aperture increased, and the accuracy requirements of the mirror are also closely related. In order to reduce the machining accuracy requirements, a freeform optical wavefront compensation method was proposed to increase the tolerance on the manufacturing error of the primary mirror. In this paper, we compensated two different large aperture telescope systems, and one of their mirrors were replaced by freeform surfaces represented by 37-term Zernike fringe polynomials in the optical system to correct the system wavefront distortion caused by the machining error of the large-aperture primary mirror. A new algorithm that is based on the principle of equal optical path and ray tracing was adopted here for the construction of freeform surfaces. The design results proved the superiority of the compensation method and the new algorithm of freeform surface. The machining accuracy demand was reduced by more than one order of magnitude, and high-quality imaging of the optical system was realized with the low-precision primary mirror.

Citation Download Citation

Cheng Huang, Yongjun Xie, and Xianglong Mao "Freeform surface compensation design for machining error of primary mirror", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 1261775 (4 April 2023); https://doi.org/10.1117/12.2666802

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KEYWORDS

Mirrors

Design and modelling

Monochromatic aberrations

Ray tracing

Manufacturing

Telescopes

Space telescopes

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