Two layer optical elements
First Claim
1. An optical element formed as a body having two layers, at least one of which is transmissive to a selected wavelength of illumination, the optical element comprising:
- one layer formed with a first surface relief optical formation as a boundary thereof; and
the other layer formed on said 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 formation, the other layer having further optical features on a surface opposite the adjacent boundary, wherein the first and second surface relief optical formations are diffractive formations and the further optical features includes a third surface relief diffractive optical formation that is a compensated conjugate of the diffractive formations.
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Accused Products
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.
37 Citations
15 Claims
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1. An optical element formed as a body having two layers, at least one of which is transmissive to a selected wavelength of illumination, the optical element comprising:
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one layer formed with a first surface relief optical formation as a boundary thereof; and the other layer formed on said 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 formation, the other layer having further optical features on a surface opposite the adjacent boundary, wherein the first and second surface relief optical formations are diffractive formations and the further optical features includes a third surface relief diffractive optical formation that is a compensated conjugate of the diffractive formations. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A dual diffractive component comprising:
a substrate including, a first layer having a first index of refraction and a first diffractive structure formed as a surface relief profile on a first surface of said first layer, and a second layer having a second index of refraction and deposited on said first diffractive structure of said first layer and a second diffractive structure formed as a surface relief profile on a first surface of said second layer, both layers being transmissive to light at a selected wavelength of illumination, at least one of said first and second layers having further diffractive features on a second surface opposite said first surface, thereof, wherein the further diffractive features is a further surface relief profile that is a compensated conjugate of the surface relief profile. - View Dependent Claims (9, 10, 11, 12)
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13. A dual diffractive component comprising:
a substrate including, a first layer having a first index of refraction and a first diffractive structure formed as a surface relief profile on a first surface of said first layer, a second layer having a second index of refraction and deposited on said first diffractive structure of said first layer and a second diffractive structure formed as a surface relief profile on a first surface of said second layer, both layers being transmissive to light at a selected wavelength of illumination, at least one of said first and second layers having further diffractive features on a second surface opposite said first surface, thereof, and a reflective coating on the second surface.
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14. An optical element formed as a body having two layers, at least one of which is transmissive to a selected wavelength of illumination, the optical element comprising:
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one layer formed with a first surface relief optical formation as a boundary thereof; the other layer formed on said 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 formation, the other layer having further optical features on a surface opposite the adjacent boundary; and a reflective coating on the surface opposite the adjacent boundary.
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15. An optical element formed as a body having two layers, at least one of which is transmissive to a selected wavelength of illumination, the optical element comprising:
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one layer formed with a first surface relief optical formation as a boundary thereof; and the other layer formed on said 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 formation, the other layer having further optical features on a surface opposite the adjacent boundary, wherein the adjacent boundary is a reflective interface.
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Specification