Design of Plane-Symmetric Low <Emphasis Type="Italic">F</Emphasis>-number Reflective System Based on Perturbation Aberration Model |
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Authors: | Takayuki Nakano Yasuhisa Tamagawa |
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Institution: | (1) Information Technology R&D Center, Mitsubishi Electric Corporation, Kamakura Kanagawa, 247-8501, Japan |
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Abstract: | 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. |
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Keywords: | design method reflective system off-axis plane-symmetry aberration perturbation astigmatism |
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