Diffractive optical element

Details Diffractive optical element Diffractive optical element

1990-06-11

1991-12-17

Arnold, Bruce Y.

Optical: systems and elements

Diffraction

From zone plate

359571, 359742, 359900, G02B 2744, G02B 308

Patent

active

050730070

ABSTRACT:
There is disclosed a diffractive optical element and a method to produce same wherein the element comprises a base and at least one phase zone comprising an arbitrary multiplicity M of steps of generally identical step height, wherein M is not a power of 2. The method includes the steps of defining a basic depth unit equivalent to a zone height divided by M, defining a depth sequence of N depths wherein N is the smallest integer greater than log.sub.2 M such that each of the M steps can be produced by at least one linear combination of the N depths, defining N masks herein each mask enables the optical element to be processed to one of the N depths and wherein for each mask, the steps to be processed are those which have the one of the N depths in its linear combination and serially utilizing each of the N masks for processing of the optical element.

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