Off-axis three-mirror reflective zoom system based on freeform surface

Guijuan XIE,Jun CHANG(),Ke ZHANG,Jide ZHOU,Yajun NIU

School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China

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Abstract

A reflective optical system is not affected by chromatic aberration, so it has a wide range of applications. Based on the design theory of reflective zoom system with three mirrors, this paper presents the simulation, optimization, and image quality evaluation of the traditional off-axis three-mirror zoom system and freeform off-axis three-mirror reflective zoom system.. In these systems, the optical design was aided by software CODEV. Through the analysis of aberrations and structural performance for the traditional aspherical off-axis three-mirror system, the freeform surface was introduced to the tertiary mirror to improve the balance capacity for optical aberrations. This off-axis three-mirror reflective zoom system based on freeform surface could provide technical reference to the study of such systems.