Optical design of free-form surface two-mirror telescopic objective with ultrawide field of view

Qinghan Liu; Zhengping Zhou; Yangming Jin; Weimin Shen

doi:10.1117/12.2241622

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24 October 2016 Optical design of free-form surface two-mirror telescopic objective with ultrawide field of view

Qinghan Liu, Zhengping Zhou, Yangming Jin, Weimin Shen

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Proceedings Volume 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 96820L (2016) https://doi.org/10.1117/12.2241622
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

Compact off-axial two-mirror fore objective with an ultra wide ground coverage and for spaceborne pushbroom imaging spectrometers is studied and designed. Based on Gaussian optics and Young's formulas, the approach to determine its initial structural parameters is presented. In order to meet the required performance, freeform surfaces are used to increase the degree of freedom of our optimization. And the impact of various X-Y polynomials on its pupil aberration is analyzed for elimination of too large smile effect. As an example, an off-axis two-mirror fore telescopic objective with field of view of 108° across-pushbroom direction, F number of 10, focal length of 34 mm and working wavelength range from 0.27 to 2.4 μm is optimally designed, which both the primary and the secondary mirrors have freeform surface. The designed lens has many advantages of simple and compact structure, imagery telecentricity, near diffraction-limited imaging quality, and small smile effect.

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Qinghan Liu, Zhengping Zhou, Yangming Jin, and Weimin Shen "Optical design of free-form surface two-mirror telescopic objective with ultrawide field of view", Proc. SPIE 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 96820L (24 October 2016); https://doi.org/10.1117/12.2241622

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