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31 March 1982 Simple Infrared Telescope With Stray-Light Rejection
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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.
© (1982) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David Shafer "Simple Infrared Telescope With Stray-Light Rejection", Proc. SPIE 0304, Modern Utilization of Infrared Technology VII, (31 March 1982);


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