Superachromatic air-spaced triplet

摘要

A theoretical analysis of properties of superachromatic air-spaced triplets composed of thin lenses is described in this paper. An interesting result is shown in that the superachromatic air-spaced triplet cannot simultaneously correct field curvature and transverse and longitudinal chromatic aberration. The formulas for the calculation of parameters of an air-spaced triplet are derived and the procedure for the calculation of the shape of individual lenses of the triplet is described using the third-order aberration theory. The application of the described analysis is presented in an example of the design of a superachromatic triplet.