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Proceedings Paper

Simple Infrared Telescope With Stray-Light Rejection
Author(s): David Shafer
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Paper Abstract

A very simple telescope is described that consists of a parabolic mirror, a small spherical mirror, and a single germanium lens. This three-element telescope is unobscured, is corrected for spherical aberration, coma, astigmatism, and Petzval curvature, and has stray-light rejection features. The good aberration correction makes it suitable for covering a substantial field of view on a flat image surface. The stray-light rejection features are: no obscuration, an aperture stop, a field stop, and a Lyot stop. The key to this new design is the novel use of two separate optical axes in the same system. The parabolic mirror and the spherical mirror have the same optical axis, but the axis of the lens is displaced and parallel. The theory of the design will be explained.

Paper Details

Date Published: 31 March 1982
PDF: 5 pages
Proc. SPIE 0304, Modern Utilization of Infrared Technology VII, (31 March 1982); doi: 10.1117/12.932683
Show Author Affiliations
David Shafer, David Shafer Optical Design, Inc. (United States)


Published in SPIE Proceedings Vol. 0304:
Modern Utilization of Infrared Technology VII
Irving J. Spiro, Editor(s)

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