Patent ID: 6441963
Filing Date: 2002-08-27
Classification: B82Y,G03F,G21K

Abstract:
A multi-layered mirror comprising:a substrate; at least one first layer of a first substance with a small refractive index; and at least one second layer of a second substance with a large refractive index, wherein the at least one first layer and the at least one second layer are alternately laminated on the substrate by sputtering, and wherein an interface between the at least one first and the at least one second layers of the multi-layered mirror has been irradiated by an ion beam and smoothed so that for d>5 nm, &sgr;intâˆ’&sgr;sub<0.2 nm, and for d<5 nm, &sgr;intâˆ’&sgr;sub<0.5 nm, where d is a periodic length defined as a sum of the first substance layer thickness and the second substance layer thickness, &sgr;sub is an RMS value of surface roughness of the substrate, and &sgr;int is an RMS value of roughness of the interface.