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Design of off-axis four-mirror optical system with wide field of view based on free-form surface
Author(s): 
Pages: 325-328
Year: Issue:  3
Journal: Laser & Infrared

Keyword:  optical system designfour-mirror optical systemwide field of viewfree-form surface;
Abstract: Reflective optical systems have small size,lightweight,and excellent imaging performance,which make it very popular in airborne field.A nonlinear equation group was built based on the matrix optics theory,the initial con-struction parameters of the optical system can be obtained by deriving this equation group.And during the design process,decenters and tilts of mirrors were adjusted continuously to eliminate the obscurations.the free-form surface was introduced to improve the balance capacity of optical aberration and enhance system field of view.Then an off-ax-is four-mirror optical system with effective focal length of 1 00 mm,FOV of 20°×20°,and relative aperture as F/7 is designed.This system has large imaging field of view,tight structure,acentric obstruction and imaging qualities ap-proaching diffraction limit.
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