Design of space-borne imager with wide field of view based on freeform aberration theory

Haodong Shi; Jizhen Zhang; Lingjie Wang; Xin Zhang; Huilin Jiang

doi:10.1117/12.2240382

24 October 2016 Design of space-borne imager with wide field of view based on freeform aberration theory

Haodong Shi, Jizhen Zhang, Lingjie Wang, Xin Zhang, Huilin Jiang

Proceedings Volume 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 96820F (2016) https://doi.org/10.1117/12.2240382
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

Freeform surfaces have advantages on balancing asymmetric aberration of the unobscured push-broom imager. However, since the conventional paraxial aberration theory is no longer appropriate for the freeform system design, designers are lack of insights on the imaging quality from the freeform aberration distribution. In order to design the freeform optical system efficiently, the contribution and nodal behavior of coma and astigmatism introduced by Standard Zernike polynomial surface are discussed in detail. An unobscured three-mirror optical system with 850 mm effective focal length, 20°× 2° field of view (FOV) is designed. The coma and astigmatism nodal positions are moved into the real-FOV by selecting and optimizing the Zernike terms pointedly, which has balanced the off-axis asymmetric aberration. The results show that the modulation transfer function (MTF) is close to diffraction limit, and the distortion throughout full-FOV is less than 0.25%. At last, a computer-generated hologram (CGH) for freeform surface testing is designed. The CGH design error RMS is lower than λ/1000 at 632.8 nm, which meets the requirements for measurement.

Citation Download Citation

Haodong Shi, Jizhen Zhang, Lingjie Wang, Xin Zhang, and Huilin Jiang "Design of space-borne imager with wide field of view based on freeform aberration theory", Proc. SPIE 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 96820F (24 October 2016); https://doi.org/10.1117/12.2240382

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