Multilayer optical dielectric coating
First Claim
1. An optical interference coating resistant to damage by intense optical radiation and comprising a number of interference layers of a given parent dielectric material, wherein adjacent layers in the coating have slightly different indices of refraction produced by doping at least some of the layers with one or more dopants wherein said one or more dopants are used in small concentrations so that the coating layers substantially retain the same physical and chemical properties of the parent, undoped dielectric material and the coating layers are thereby thermomechanically and chemically compatible.
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Accused Products
Abstract
A highly damage resistant, multilayer, optical reflective coating includes alternating layers of doped and undoped dielectric material. The doping levels are low enough that there are no distinct interfaces between the doped and undoped layers so that the coating has properties nearly identical to the undoped material. The coating is fabricated at high temperature with plasma-assisted chemical vapor deposition techniques to eliminate defects, reduce energy-absorption sites, and maintain proper chemical stoichiometry. A number of differently-doped layer pairs, each layer having a thickness equal to one-quarter of a predetermined wavelength in the material are combined to form a narrowband reflective coating for a predetermined wavelength. Broadband reflectors are made by using a number of narrowband reflectors, each covering a portion of the broadband.
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Citations
29 Claims
- 1. An optical interference coating resistant to damage by intense optical radiation and comprising a number of interference layers of a given parent dielectric material, wherein adjacent layers in the coating have slightly different indices of refraction produced by doping at least some of the layers with one or more dopants wherein said one or more dopants are used in small concentrations so that the coating layers substantially retain the same physical and chemical properties of the parent, undoped dielectric material and the coating layers are thereby thermomechanically and chemically compatible.
- 18. A reflective optical coating highly resistant to damage by intense optical radiation and comprising a first plurality of alternating layers having different indices of refraction formed by doping at least some of said layers with one or more dopants, wherein each of said layers has a thickness of one-fourth wavelength for a first wavelength, which coating forms a first narrowband reflector for said first wavelength.
- 27. An optical coating highly resistant to damage by intense optical radiation and formed of very small stepwise incremental deposits of a dielectric material, each of said incremental deposits being doped with one or more doping materials to slightly alter the index of refraction of adjacent incremental deposits to form a predetermined stepwise profile for the index of refraction of said coating.
Specification