Acta Photonica Sinica, Volume. 48, Issue 3, 322002(2019)
Optical Design of Wide Field View and Large Relative Aperture Off-axis Three-mirror Reflective System with Tilted Optical Axis
The linear astigmatism balance condition of the off-axis three-mirror optical system was deduced, on that base the off-axis three-mirror reflective system for astigmatism correction with large relative aperture and large field of view was proposed by tilting the optical axis. The field of view is 5°×5°, relative aperture is 1/3.1, entrance pupil diameter is 250 mm and spectral range is 400~2 500 nm. The proposed system was compared with the off-axis three-mirror reflective system of coaxial quadratic aspheric surface and the off-axis three-mirror reflective system of coaxial high-order even aspheric surface with the same optical parameters. The results show that the optical transfer function of off-axis three-mirror reflective system with tilted optical axis is greater than 0.73 at 17 lp/mm in all field of view. It uses conical surfaces and shows obvious advantages in imaging quality. In addition, the processing and adjustment of off-axis three-mirror reflective system with tilted optical axis are analyzed, the tolerance is relatively loose and the structure can be realized.
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LIU Qiang, WANG Xin, HUANG Geng-hua, SHU Rong. Optical Design of Wide Field View and Large Relative Aperture Off-axis Three-mirror Reflective System with Tilted Optical Axis[J]. Acta Photonica Sinica, 2019, 48(3): 322002
Received: Oct. 12, 2018
Accepted: --
Published Online: Apr. 2, 2019
The Author Email: Qiang LIU (qliu@niaot.ac.cn)