Design of Cassegrain-Schmidt optical system

Peiming Hao; Kexin Li; Zhengting Wang

doi:10.1117/12.783681

14 November 2007 Design of Cassegrain-Schmidt optical system

Peiming Hao, Kexin Li, Zhengting Wang

Proceedings Volume 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 67224F (2007) https://doi.org/10.1117/12.783681
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

The image plane of Newton-Schmidt system is between Schmidt corrector and spheric mirror, which is difficult to be received. Cassegrain-Schmidt system is put forward to shift the image plane behind the primary mirror¹. Based on the third order aberration theory and Gaussian formula, and choices of defocus Δ and neutral zone h_n, new parameters obscuration ratio of two Cassegrain α mirrors and magnification of the secondary mirror β and concentric condition of two Cassegrain mirrors, the equation of corrector including the 2^nd and 4^th order terms of the even aspheric plate is established. Then the 4^th, 6^th and 8^th order terms of Schmidt corrector plate are solved by inverse-ray tracing to correct high order spherical aberration. To reduce chromatic aberration of Cassegrain-Schmidt system, new types of achromatic Cassegrain-Schmidt systems are put forward and discussed.

Citation Download Citation

Peiming Hao, Kexin Li, and Zhengting Wang "Design of Cassegrain-Schmidt optical system", Proc. SPIE 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 67224F (14 November 2007); https://doi.org/10.1117/12.783681

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