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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 17,
  • Issue 9,
  • pp. 092201-
  • (2019)

Design method for freeform reflective-imaging systems with low surface-figure-error sensitivity

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Abstract

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 surface-figure-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.

© 2019 Chinese Laser Press

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