Partial output results of the fine search of the VIS freeform imaging system having a focal length of 600 mm and an F-number of 3 (IMAGE)
Caption
The specifications of the third design example are challenging. The three-mirror freeform imaging system has a field-of-view of 4°×4°, a focal length of 600 mm and a F-number of 3, which works in the VIS band. Through 22.2 hours of automatic computation on a working station, 48 systems with the are obtained with the AVG WFE RMS smaller than 0.30λ (λ = 587.6 μm). The best AVG WFE RMS in the coarse search is 0.11λ. Taking the system with the best imaging quality as the center, a fine search is conducted and system with the AVG WFE RMS smaller than 0.075λ is eventually obtained, as shown by V2-885-1-34-1. The five systems shown in this figure have the AVG WFE RMS smaller than 0.11λ.
Credit
by Benqi Zhang, Guofan Jin and Jun Zhu
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