Design and exploration of freeform three-mirror imaging systems with integrated primary and tertiary mirrors using same expression

Lijun Zhou; Tong Yang; Dewen Cheng; Yongtian Wang

doi:10.1117/12.2651242

20 January 2023 Design and exploration of freeform three-mirror imaging systems with integrated primary and tertiary mirrors using same expression

Lijun Zhou, Tong Yang, Dewen Cheng, Yongtian Wang

Author Affiliations +

Proceedings Volume 12559, AOPC 2022: Novel Optical Design; and Optics Ultra Precision Manufacturing and Testing; 125590B (2023) https://doi.org/10.1117/12.2651242
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

A typical and widely used configuration of freeform imaging system is freeform off-axis three-mirror systems. However, as the system configuration and surface shape have no rotational symmetry, the assembly process will be very difficult. In this paper, we designed off-axis three-mirror systems in which the primary and tertiary mirrors are integrated into one single element. The two mirrors use different portions of a single mirror, which is represented by one mathematical expression. The design process of the system is demonstrated in detail, and three different kinds of light folding geometry are explored. The system design using different types of freeform surface is also explored and the imaging performance is compared. Finally, tolerance analysis which considers the local and random nature of surface error and actual manufacturing difficulty of the freeform surface is conducted.

Citation Download Citation

Lijun Zhou, Tong Yang, Dewen Cheng, and Yongtian Wang "Design and exploration of freeform three-mirror imaging systems with integrated primary and tertiary mirrors using same expression", Proc. SPIE 12559, AOPC 2022: Novel Optical Design; and Optics Ultra Precision Manufacturing and Testing, 125590B (20 January 2023); https://doi.org/10.1117/12.2651242

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KEYWORDS

Design and modelling

Imaging systems

Mirrors

Tolerancing

Off axis mirrors

Image quality

Zernike polynomials

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