Analysis and design of coaxial three-mirror anastigmat with long effective focal length and full two-dimensional field

Han Lin; Mao Baoqi; Sun Wen; Shen Weimin

doi:10.1117/12.2241619

24 October 2016 Analysis and design of coaxial three-mirror anastigmat with long effective focal length and full two-dimensional field

Han Lin, Mao Baoqi, Sun Wen, Shen Weimin

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Proceedings Volume 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 96820E (2016) https://doi.org/10.1117/12.2241619
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

There is a race to develop spaceborne high-resolution video cameras since Skybox’s success. For low manufacture cost and adaption to micro and small satellites, it is urgent to design and develop compact long focal length optical system with not only small volume, light weight and easy implementation, and also two dimensional field. Our focus is on the Coaxial Three-Mirror Anastigmat (CTMA) with intermediate real image for its no need outer hood and compactness and for its easy alignment, low-order aspheric surface and low cost. The means to deflect its image space beam for accessibility of focal plane array detector and to eliminate its inherent secondary obscuration from its primary mirror central hole and deflection flat mirror is discussed. The conditions to satisfy the above-mentioned requirements are presented with our derived relationship among its optical and structural parameters based on Gaussian optics and geometry. One flat mirror near its exit pupil can be used to deflect its image plane from its axis. And its total length can be decreased with other some flat mirrors. Method for determination of its initial structure with the derived formulae is described through one design example. Furthermore, optimized CTMA without secondary obscuration and with effective focal length (EFFL) of 10m is reported. Its full field, F-number and total length are respectively 1.1°×1°, F/14.3, and one eighth of its EFFL. And its imaging quality is near diffraction limit.

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Han Lin, Mao Baoqi, Sun Wen, and Shen Weimin "Analysis and design of coaxial three-mirror anastigmat with long effective focal length and full two-dimensional field", Proc. SPIE 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 96820E (24 October 2016); https://doi.org/10.1117/12.2241619

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KEYWORDS

Mirrors

Monochromatic aberrations

Modulation transfer functions

Cameras

Distortion

Diffraction

Video

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