Off-axis three-mirror imaging system based on free-form surface substrate phase element

Abstract

The invention relates to a compact off-axis imaging system based on a free-form surface substrate phase element, comprising: a main reflector, a primary reflector, a third reflector and a detector; the main reflector is used to square light to form a first reflected light; the secondary reflector is used to reflect the first reflected light twice to form a second reflected light; the third reflector is used to reflect the second reflected light again to form a third reflected light; the detector is used for receiving the third reflected light and forming an image. The primary reflector, the secondary reflector, and the third reflector are free-form surface base phase elements; the optical path of the first reflected light, the optical path of the second reflected light and the optical path of the third reflected light overlap each other , the system is compact.

Description

technical field [0001] The invention relates to the technical field of optical system design, in particular to an off-axis three-mirror imaging system based on a free-form surface base phase element. Background technique [0002] Compared with spherical and aspherical surfaces, freeform surfaces provide more degrees of freedom for optical design, so they can provide stronger aberration correction capabilities. In recent years, with the continuous development of advanced manufacturing technology, freeform surfaces have been successfully used in the fields of imaging and illumination. As consumer demands grow, freeform surfaces are expected to be used to design ultra-compact, high-performance systems. In some system requirements, the light must be deflected at a large angle, which will cause the surface shape to be unrealistic. In some extreme design tasks, the freeform surface provides insufficient variables, which will lead to a higher number of components used in the syst...

AI Technical Summary

Problems solved by technology

In some system requirements, the light must be deflected at a large angle, which will cause the surface shape to be unrealistic

In some extreme design tasks, freeform surfaces provide insufficient variables, which will lead to a higher number of components used in the system design, thereby increasing the complexity, size and weight of the system

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