Design Method for Freeform Off-Axis Three-Mirror Anastigmat Optical Systems with a Large Field of View and Low Error Sensitivity

• DOI: 10.3390/photonics11030211
• Publication Date: 2024-02-26T16:31:21Z
• Authors: Chengming Ren; Qingyu Meng
• Keywords: low error sensitivity; freeform TMA optical systems; FOV expansion; 0211 other engineering and technologies; 0202 electrical engineering, electronic engineering, information engineering; Applied optics. Photonics; TA1501-1820

A freeform off-axis three-mirror anastigmat (TMA) optical system with a large field of view (FOV) can obtain target image information larger spatial range and more details, which is development trend within the realm space optics. The aberration increases exponentially FOV, resulting in significant increase error sensitivity for large-FOV systems. To address this issue, method designing systems FOV low proposed. gradually expanded from small initial value equal-length increments until it reaches full FOV. At each step, recalculated controlled to lesser extent than previous step. In design process, surface used correct sensitivity. An focal length 1000 mm an F-number 10 as example, enlarged 5° × 1° 20° 4°. results show that modulation transfer function (MTF) reach 0.45@50 lp/mm, average wavefront 0.029λ. After four rounds expansion optimization, reduced by 37.27% compared system, verifies correctness practicality method.