All reflective 2 mirror unobscured wide field telescope/collimator designs

R. F. Horton; Thom Peck; Art Colgate

doi:10.1117/12.857310

5 August 2010 All reflective 2 mirror unobscured wide field telescope/collimator designs

R. F. Horton, Thom Peck, Art Colgate

Proceedings Volume 7733, Ground-based and Airborne Telescopes III; 77332U (2010) https://doi.org/10.1117/12.857310
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

A new family of 2 mirror wide field unobscured telescopes have been designed. They are of compact "Schiefspiegler", off axis Cassegrain geometry, incorporating aspheres, tilted and decentered secondary, and tilted focal surfaces. These additional optimization variables allow control of the tilt of the focal surface. Designs range from f/5 to f/16, and provide fully baffled, all reflecting systems with no color, moderately wide diffraction limited fields of view with unobscured aperture MTF. The systems are well suited for use as visual telescopes, CCD camera or high resolution wide field collimator and IR scene projector. The nCUB designs provide a focal surface normal to the gut ray for visual use. The tCUB designs provide collimator telescopes with focal surfaces tilted so that any light reflected from the reticle is eliminated and with it Narcissus. Instead, this reflection can be used to provide a uniform "background" irradiance field. Simple interferometric tests allow straightforward element figuring and system alignment. Examples will be described and compared to current designs. Manufacturing, testing and mounting of the optical system will be briefly discussed.

Citation Download Citation

R. F. Horton, Thom Peck, and Art Colgate "All reflective 2 mirror unobscured wide field telescope/collimator designs", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77332U (5 August 2010); https://doi.org/10.1117/12.857310

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