Design of Fore-Optical System with Zernike Surface and High-Speed for Hyper-Spectral Imagers

Contra posed the requirement of high speed for hyper-spectral imagers, a high speed fore-optical system is designed with free-form surface of Zernike polynomial. According to the relation between the coefficient of the Zernike polynomial and the Seidel aberration, control the aberrations every field and alternation optimizating with a specific aim. This system has an off-three mirrors structure with "concave-convex-concave", three surfaces are all free-form, telecentric in image space. Its F-number is 1.0, its focal length 360mm, and its field of view 3 ×0.02 degrees. This system is compact and diffraction-limited. Its uniqueness is that the chief ray on the 0 field of view traces along the line between every vertex of every elements so that its test difficulty and cost is greatly reduced, the working distance is 100mm and good for playing the color filters.