22 October 2004 Four-mirror anastigmats with useful first-order layouts and minimum complexity
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Recently the author described a method that gave the complete solution set for four-mirror anastigmats in which all the mirrors were spherical. Even though a large variety of such systems were shown to exist, most of these were not practical due to large central obstructions. The author has now modified his previous approach by setting up "partial" systems with good first order characteristics and adding the minimum number of aspheres necessary to give anastigmatic correction. In this way, surveys of useful four-mirror anastigmats with one, two or three-mirrors kept strictly spherical can be carried out.
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Andrew Rakich, "Four-mirror anastigmats with useful first-order layouts and minimum complexity", Proc. SPIE 5524, Novel Optical Systems Design and Optimization VII, (22 October 2004); doi: 10.1117/12.557563; https://doi.org/10.1117/12.557563

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