Physics – Optics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apopt..16.2074k&link_type=abstract
Applied Optics, vol. 16, Aug. 1977, p. 2074-2077.
Physics
Optics
12
Anastigmatism, Mirrors, Reflecting Telescopes, Spaceborne Telescopes, Ultraviolet Radiation, Aberration, Focal Plane Devices, Imaging Techniques, Optical Correction Procedure, Optical Paths, Ultraviolet Photography, Ultraviolet Reflection
Scientific paper
A three-mirror telescope arrangement that can be corrected for four aberrations (coma, spherical aberration, field curvature, and astigmatism) is described. Geometric spot size is less than 0.1 sec of arc, in an easily accessible flat field of 1.5 deg. The primary-secondary configuration is Cassegrain-like, with the real image formed closely behind the primary. This secondary image is re-imaged by a tertiary mirror at roughly unit magnification. A small, flat mirror at the exit pupil, located between primary and tertiary, folds the light rectangularly away from the telescope axis. The shape of the large image area is helpful in space applications where several instruments may share the focal plane.
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