Patent ID: 6310905
Filing Date: 2001-10-30
Classification: G02B

Abstract:
A mirror for an ultraviolet laser comprising a substrate, an aluminum film formed contiguous to the substrate; a first low refractive index layer superimposed over said aluminum film and having an optical thickness of 0.125-0.175 .lambda., where .lambda. is the laser beam wavelength; a second layer superimposed over said first layer, said second layer comprising a dielectric multi-layer film having an alternating arrangement of layers of low refractive index and high refractive index, each of said layers of said multi-layer film having an optical thickness of 0.25-0.35 .lambda. and wherein the dielectric multiple-layer film structure is shown by the following representation:L.sub.1 /[H/L.sub.2 ].sup.Xwhere:L.sub.1, L.sub.2 : represents the low refractive index layers;H: represents the high refractive index layer(s); andX: defines an integer between 1 and 10.