DEFLECTION MIRROR AND PROJECTION EXPOSURE APPARATUS FOR MICROLITHOGRAPHY COMPRISING SUCH A DEFLECTION MIRROR

摘要

The invention relates to a deflection mirror for a microlithography projection exposure apparatus for illuminating an object field in an object plane of the projection exposure apparatus using the deflection mirror with grazing incidence. Said deflection mirror consists of a substrate and at least one layer system, and during operation light impinges on said mirror at a multiplicity of angles of incidence, wherein the layer system is designed such that, for light having a wavelength of less than 30 nm, for an angle of incidence of between 55° and 70°, the variation of the reflectivity is less than 20%, in particular less than 12%.