Abstract
The superresolving filter design of Toraldo di Francia [ Atti. Fond. Giorgio Ronchi 7, 366 (
1952)], which consists of an array of
concentric annuli of finite width, is studied. Such a filter compares favorably
with other superresolving filter designs while being considerably more simple to
fabricate. In particular, for given input energy, the intensity at the focal
point is usually greater than for optimized filter designs. The manufacturing
tolerances of such a filter are discussed.
© 1982 Optical Society of America
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