Two layer optical elements

Details Two layer optical elements Two layer optical elements

1997-12-02

1999-12-21

Spyrou, Cassandra

Optical: systems and elements

Diffraction

From grating

359 13, 359572, G02B 518, G03H 100

Patent

active

060057149

ABSTRACT:
An optical element is formed as a body having two layers, at least on of which is transmissive to a selected wavelength of a light of illumination. One layer is formed with a first surface relief optical formation as a boundary thereof, and the other layer is formed on the boundary so as to have an adjacent boundary that is a second surface relief optical formation that is the conjugate of the first surface relief optical formation. The other layer also has further optical features on a surface opposite the adjacent boundary. The formation and features are preferably diffractive. The further optical features opposite the adjacent boundary is preferably a compensated conjugate of the formation at the adjacent boundary.

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Use of "X Prism" Concept article; undated--admitted prior art.

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