DIFFRACTIVE LENS

A diffractive lens has a plurality of diffractive zones at least one of which has an optical step having an optical height equal to j .lambda. and at least one of which has an optical step having an optical height equal to k .lambda. where .lambda. is a design wavelength of the lens and j and k are...

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Bibliographic Details
Main Author FUTHEY, JOHN A
Format Patent
LanguageEnglish
Published 09.02.1991
Subjects
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:A diffractive lens has a plurality of diffractive zones at least one of which has an optical step having an optical height equal to j .lambda. and at least one of which has an optical step having an optical height equal to k .lambda. where .lambda. is a design wavelength of the lens and j and k are unequal nonzero integers. Alternatively stated at least one of the optical steps induces a relative phase shift of 2j.pi. at the back conjugate point between two light rays emerging from a point source at the front conjugate point and striking the lens immediately on opposite sides of the step and at least one of the steps induces a relative phase shift of 2k.pi. at the back conjugate point between two light rays emerging from a point source at the front conjugate point and striking the lens immediately on opposite sides of that step.
Bibliography:Application Number: CA19902022049