Paper
22 June 2006 Mitigation of third order spherical, coma, and astigmatism using segmented mirrors
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Abstract
Constructing telescope pupil mirrors, most traditionally the primary mirror, from a series of hexagonal segments enables the construction of larger telescopes and offers a degree of aberration mitigation beyond what is feasible with traditional monolithic mirror design. The degree of correction possible varies as a function of the number of segments used to construct the mirror, the nature of the mirror surface, and the degrees of freedom available to adjust each segment. This presentation discusses the degree of aberration mitigation possible as the number of segments used increases from 6 to 60 for a constant aperture system. It includes considerations for powered or flat segmented mirrors for the cases where segmentation at other pupil positions besides the primary might be considered. It also includes the effects of 3 levels of segment adjustability: (a) piston and tilt only, (b) 6 degree of freedom, and (c) 6DOF plus radius of curvature adjustment.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James Contreras "Mitigation of third order spherical, coma, and astigmatism using segmented mirrors", Proc. SPIE 6271, Modeling, Systems Engineering, and Project Management for Astronomy II, 62710J (22 June 2006); https://doi.org/10.1117/12.669362
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KEYWORDS
Monochromatic aberrations

Mirrors

Image segmentation

Segmented mirrors

Spherical lenses

Telescopes

Optical alignment

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