Optical elements having improved environmental stability and methods of making same
AssigneeCorning Incorporated
InventorsGerald Philip Cox, Jing Du, Jue Wang
Life of this patent
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Abstract
An optical element includes a substrate and a coating supported by the substrate. The coating includes, in an order moving away from the substrate, a period including a high refractive index metal fluoride layer and a low refractive index metal fluoride layer and a capping layer including SiO2, F—SiO2, or a combination thereof. The capping layer includes a density greater than or equal to 2.20 g/cm3 and less than 2.28 g/cm3. A method of making the optical element includes depositing the capping layer at a temperature greater than or equal to 200° C. and less than 300° C. and using ion treatment.
Claims20
An optical element comprising:
- a substrate;
- and
- a coating supported by the substrate,
- wherein the coating comprises, in an order moving away from the substrate:
- a period comprising a high refractive index metal fluoride layer and a low refractive index metal fluoride layer;
- and
- a capping layer comprising SiO2, F—SiO2, or a combination thereof, the capping layer comprising a density greater than or equal to 2.20 g/cm3 and less than 2.28 g/cm3.
Dependencies are inferred from the claim text.