Patent ID: 6780496
Filing Date: 2004-08-24
Classification: B82Y,G02B,G21K,Y10T

Abstract:
A passivating overcoat bilayer for a multilayer reflective coating designed for use in extreme ultraviolet or soft x-ray applications, comprising:a multilayer reflective coating comprising a plurality of alternating layers of relatively high index material and low index material, wherein said multilayer reflective coating comprises a top surface and a bottom surface; a substrate, wherein said bottom surface is affixed directly to said substrate; a bottom overcoat layer affixed directly to said top surface of said multilayer reflective coating; and a top overcoat layer affixed directly to said bottom overcoat layer, wherein said bottom overcoat layer comprises material that prevents diffusion of said top overcoat layer into said top layer of said multilayer reflective coating, wherein said top overcoat layer comprises material that resists oxidation and corrosion and protects said multilayer reflective coating from oxidation.