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Proceedings Paper

Field of view and coma correction of a two mirror off-axis system
Author(s): Jingquan Cheng; Xinnan Li; Ming Liang; Brian Mason
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Paper Abstract

Off-axis systems in radio and infrared wavelengths have obvious advantages in suppressing aperture blockage and background noise. Therefore, the signal-to-noise ratio as well as system gain is improved. However, an off-axis optical system involves complex aberrations which limit its field of view. This paper provides an overview of aberrations in axial symmetric and off-axis optical systems. As the system deviates from an axial symmetric one, system aberrations become more and more complicated. In a general two mirror off-axis focusing system, the field of view is nearly zero. Even for off-axis system with an equivalent parabola, the field of view is still very small as the linear astigmatism dominates the system. An optimized off-axis system is one in which the linear astigmatism and cross polarization-free conditions are met. In this optimized system, coma aberration is dominant, so that the field of view is still limited. The field of view of an optimized off-axis system can be improved using a simple coma corrector system.

Paper Details

Date Published: 6 August 2010
PDF: 7 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77335J (6 August 2010); doi: 10.1117/12.855878
Show Author Affiliations
Jingquan Cheng, National Radio Astronomy Observatory (United States)
Xinnan Li, Nanjing Institute of Astronomical Optics & Technology (China)
Ming Liang, National Optical Astronomy Observatory (United States)
Brian Mason, National Radio Astronomy Observatory (United States)

Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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