Design of off-axis four-mirror optical system based on vector aberration theory

Reflective optical systems have many advantages such as no chromatic aberration, wide detection band range, suitable for large aperture, light weight and compact structure. More and more two-mirror and three-mirror optical systems have been applied widely, which greatly promotes the development of space optical detection technology. With the continuous development of optical design, in order to increase the field of view, eliminate stray light and compact systems structure, some off-axis four mirror optical systems have been designed. Based on the vector wave-front aberration theory of reflective optical systems, a design method of off-axis four-mirror optical system is proposed in this paper. This method is more intuitive in aberration optimization and can greatly improve the design efficiency of optical system. At last, by using of the optical design software CODE V, a four-mirror optical system with the off-axis field of view is designed.