Simple infrared telescope with stray-light rejection

Details Simple infrared telescope with stray-light rejection Simple infrared telescope with stray-light rejection

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982spie..304..171s&link_type=abstract

In: Modern utilization of infrared technology VII; Proceedings of the Seventh Annual Seminar, San Diego, CA, August 27, 28, 1981

Physics

Aberration, Infrared Telescopes, Mirrors, Optical Correction Procedure, Parabolic Reflectors, Astigmatism, Field Of View, Focusing, Germanium, Lens Design, Ray Tracing, Spheres, Surface Geometry

Scientific paper

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.

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