Designing an all-reflective, long focus and large field of view optical system with freeform surface

Qingfeng Wang; Dewen Cheng; YongTian Wang; Yue Liu

doi:10.1117/12.999504

27 November 2012 Designing an all-reflective, long focus and large field of view optical system with freeform surface

Qingfeng Wang, Dewen Cheng, YongTian Wang, Yue Liu

Proceedings Volume 8557, Optical Design and Testing V; 85570Q (2012) https://doi.org/10.1117/12.999504
Event: Photonics Asia, 2012, Beijing, China

Abstract

All-reflective optical system has been widely used in the deep space detection applications. We studied the application of freeform surface in all-reflective, off-axis optical systems, which have long effective focal length and large field of view, were designed. The freeform surface was employed to achieve better performance, while reduce the system size and weight. The starting point of the design was calculated by using the geometrical optics and properties of conic. After that we optimized the starting point using the strategy of successive approximation optimization method to reduce the design difficulty. Based on the theory of aberration, the best position of freeform surface in the off-axis system was analyzed. At last, two four-mirror optical systems with long EFL and large field of view were designed, the effective focal length are 1.95m and 4.5m, respectively; the field of view for both systems are 3°. The modulation transfer function is close to diffraction limit.

Citation Download Citation

Qingfeng Wang, Dewen Cheng, YongTian Wang, and Yue Liu "Designing an all-reflective, long focus and large field of view optical system with freeform surface", Proc. SPIE 8557, Optical Design and Testing V, 85570Q (27 November 2012); https://doi.org/10.1117/12.999504

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