21 August 2009 A spherical catadioptric telescope system based on Cooke corrector group
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To obtain a number of advantages in fabrication, testing and alignment, many designs in which spherical mirrors replace classical Cassegrain-form aspheric mirrors are present in the literature. However, spherical mirrors suffer from substantial spherical aberration and thereby require some form of corrector group. But in this case, the question encountered is that of making the basic optical configuration more complex. In this paper, a new design based on Cooke corrector group is presented for eliminating spherical aberration, which is believed to provide higher performance with less complexity than previous approaches. Besides, the cost and fabrication period will be extremely decreased. The telescope system using corrector group here can achieve good optical performance with f# of 10, full field of 0.5°, obscuration of 1/3 and MTF (Modulation Transfer Function) of 0.48 corresponding to 50@lp/mm.
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Jian Zhang, Jian Zhang, Yusi Kang, Yusi Kang, Weiqi Liu, Weiqi Liu, } "A spherical catadioptric telescope system based on Cooke corrector group", Proc. SPIE 7429, Novel Optical Systems Design and Optimization XII, 74290T (21 August 2009); doi: 10.1117/12.825562; https://doi.org/10.1117/12.825562

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