设计了一种宽谱段大口径透射式摄影镜头,主要光学参数:焦距f′=200 mm,口径D=160 mm,视场角2ω=18°,光谱范围400 μm～950 μm.通过增加透镜个数,分裂厚透镜,选择具有相似色散特性的玻璃等方法将双高斯物镜复杂化,并且通过减小透镜通光口径消除部分边缘光线来改善像质.最终设计出的光学系统在空间频率30 lp/mm时MTF 大于0.55,且各种像差都得到了很好地校正,像质均匀,满足宽谱段大口径摄影镜头的要求.%A large-aperture camera lens working in the wide spectral range is designed, whose main optical parameters are shown as follows: f′= 200 mm, D= 160 mm, 2ω=18°, λ=400～950 nm. The double Gauss objective is complicated by adding the quantity of lens, dividing a thick lens into some lenses and choosing glasses with similar dispersive characteristic, and the imaging quality is improved by minishing the clear aperture of the lens to eliminate partial marginal beam. The MTF of the finally-designed system is higher than 0.55 at the spatial frequency of 30 lp/mm. All sorts of the aberrations are corrected well, and the image quality is uniform in all the fields. The parameters obtained for the system meet the requirement of the large aperture camera lens working in the wide spectral range.
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