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All-reflective optical systems have theoretically no chromatic aberration and are suitable for wide spectral application,
but co-axial reflective systems are difficult to design as low F-number optical systems. In this paper, the aberration of plane-symmetric optical systems with low F-number is analyzed based on the wavefront derived from optical path length. Up to third-order aberrations are classified
into three categories by their characteristics. The reduction method of the dominant aberration, astigmatism-like aberration,
is proposed. In the method, the Gauss image plane is modeled by means of a simplified mirror surface with third-order approximation.
Because the system is plane-symmetric, symmetric cross section and asymmetric cross section are modelled differently. The
design example of a three-mirror system with F/2 is shown. 相似文献
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