Calculating aberration fields of freeform imaging optics with field dependent footprints

Yijie Dai; Yingli Liu; Fanqi Shen; Rengmao Wu

doi:10.1117/12.2598971

9 October 2021 Calculating aberration fields of freeform imaging optics with field dependent footprints

Yijie Dai, Yingli Liu, Fanqi Shen, Rengmao Wu

Proceedings Volume 11895, Optical Design and Testing XI; 118950K (2021) https://doi.org/10.1117/12.2598971
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Abstract

Freeform surfaces are widely used in optical design, due to the high design degree of freedom. The aberration theory of freeform optics can better lead designers to obtain a good structure. However, the existing aberration theory of freeform optics is only suitable for the optical system with a relatively small field of view (FOV). In this case, each field area (footprint) shows approximately the same shape and size, and positions of footprints across a surface have a linear relationship with fields. A wide FOV freeform optical system is analyzed in this paper. Parameters of all fields based on real-ray trace and non-linear interpolation can be employed to calculate the aberration generated by freeform terms. Then, to correct aberrations, coefficients of freeform terms are calculated using the least-square fitting method. By bringing back the coefficients to the optical system, the result shows great performance when using non-linear interpolation.

Conference Presentation

Citation Download Citation

Yijie Dai, Yingli Liu, Fanqi Shen, and Rengmao Wu "Calculating aberration fields of freeform imaging optics with field dependent footprints", Proc. SPIE 11895, Optical Design and Testing XI, 118950K (9 October 2021); https://doi.org/10.1117/12.2598971

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