Patent ID: 9296648
Filing Date: 2016-03-29
CPC Classification: C03C,C23C,G02B,H01J

Claim Text:
1. A coated substrate comprising: a substrate; and a multilayer antireflection coating on at least one side of the substrate, the multilayer antireflection coating comprising layers having a higher refractive index alternated with layers having a lower refractive index, wherein the layers having a lower refractive index are formed of silicon oxide with a proportion of aluminum and have a first ratio of an amount of aluminum to an amount of silicon that is greater than 0.05, but with the amount of silicon being predominant relative to the amount of aluminum, and wherein the layers having a higher refractive index include a material selected from the group consisting of a silicide, an oxide, and a nitride, and wherein the multilayer antireflection coating has the layer having the lower refractive index as an upper surface so that the upper surface has an average roughness and a root mean squared roughness of less than 1.5 nm each, based on an area of one square micrometer.