Freeform surfaces are difficult to manufacture due to their lack of rotational symmetry. To reduce the requirements for manufacturing precision, a design method is proposed for freeform reflective-imaging systems with...Freeform surfaces are difficult to manufacture due to their lack of rotational symmetry. To reduce the requirements for manufacturing precision, a design method is proposed for freeform reflective-imaging systems with low surfacefigure-error sensitivity. The method considers both the surface-figure-error sensitivity and optical specifications,which can design initial systems insensitive to surface figure errors. Design starts with an initial planar system;the surface-figure-error sensitivity of the system is reduced during construction. The proposed method and another that is irrelevant to figure-error sensitivity are used to design a freeform off-axis three-mirror imaging system.Comparison of the sensitivities of the two systems indicates the superiority of our proposed method.展开更多
基金supported by the National Natural Science Foundation of China(No.61775116)
文摘Freeform surfaces are difficult to manufacture due to their lack of rotational symmetry. To reduce the requirements for manufacturing precision, a design method is proposed for freeform reflective-imaging systems with low surfacefigure-error sensitivity. The method considers both the surface-figure-error sensitivity and optical specifications,which can design initial systems insensitive to surface figure errors. Design starts with an initial planar system;the surface-figure-error sensitivity of the system is reduced during construction. The proposed method and another that is irrelevant to figure-error sensitivity are used to design a freeform off-axis three-mirror imaging system.Comparison of the sensitivities of the two systems indicates the superiority of our proposed method.
