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6 August 2010 Field of view and coma correction of a two mirror off-axis system
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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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jingquan Cheng, Xinnan Li, Ming Liang, and Brian Mason "Field of view and coma correction of a two mirror off-axis system", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77335J (6 August 2010);


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