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Proceedings Paper

Design of the aplanatic and anastigmatic two-mirror four-reflection system
Author(s): Frank Gallert
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Paper Abstract

The invention relates to a mirror system with two mirrors and four reflections, comprising a concentrating reflector and a diffusion reflector fitted on the same optical axis, an image field and a detector. The concentrating reflector has a central drilling. The concentrating reflector reflects the light to the outer part of the diffusion reflector, from where the light is reflected on the concentrating reflector again, that reflects the light on the central part of the diffusion reflector, that in turn reflects the light through the central drilling to the image plane. Prior art twin- mirror systems like the Ritchey-Chretien system do not correct astigmatism, curvature of the image field and distortion. According to the invention spherical aberration, coma and astigmatism are corrected by double reflection at both mirrors, whereby the concentrating mirror and the outer part are hyperbolically shaped and whereby the inner part of the diffusion reflector is elliptical, spherical or ellipsoidal shaped. That depends from the axial radius of curvature of the diffusion mirror in relation to the distance between both mirrors. Hence--this shape depends from the overall focal length of the mirror system in relation to the paraxial focal length of the concentrating reflector.

Paper Details

Date Published: 23 August 1996
PDF: 9 pages
Proc. SPIE 2774, Design and Engineering of Optical Systems, (23 August 1996); doi: 10.1117/12.246733
Show Author Affiliations
Frank Gallert, Entwicklungs-und Konstruktionsbuero fuer Technische Optik (Germany)

Published in SPIE Proceedings Vol. 2774:
Design and Engineering of Optical Systems
Joseph J. M. Braat, Editor(s)

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