Patent ID: 7982854

Claim:
A projection exposure system, comprising: a light source configured to produce light in the EUV region; a first optical system configured to illuminate a mask by the light of the light source; and a second optical system configured to image the mask on a structural member; wherein at least one polarization-optical element for the EUV region is disposed in a beam path between the light source and the structural member, the at least one polarization-optical element comprises a substrate being at least partially transparent for a first polarization state of the EUV light being incident under a given angle of inclination α, the at least one polarization-optical element comprises a layer structure which is arranged on the substrate and which is reflective for a second polarization state of the EUV light, and the projection exposure system is microlithography projection exposure system, wherein the layer structure comprises alternately successive molybdenum layers and silicon layers.