Abstract
This paper designs an imaging optical system with a large relative aperture and large field of view based on the improved Mangin mirror. And it proposes a design method by analyzing the aberrations of Mangin mirror. The system uses the structure of a combination of catadioptric optical system and modified Mangin mirror. The system works in 450–850 nm band with 4° × 4° field of view, 1.8 F number, and 380 mm effective focal length. The imaging detector is a CMOS with detector with 2 μm × 2 μm pixels. The modulation transfer function value is greater than 0.50 at the Nyquist frequency 250 lp/mm and close to the diffraction limit. The secondary mirror of the system is designed, which is based on the theory of achromatic lens and Mangin mirror. The focal power of the achromatic Mangin mirror is solved by PW method which is based on the spherical aberration and off sine aberration obtained from the preliminary optimization analysis of the system initial structure. The focal power and radius of three surfaces of the achromatic Mangin mirror can be calculated by the achromatic conditions and residual chromatic aberration of the system. The system has good imaging quality with small monochromatic aberrations and chromatic aberrations.
Published Version
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