Patent ID: 7130023

Claim:
A lithographic apparatus comprising: a radiation system to provide a projection beam of radiation; a support structure to support a patterning device, the patterning device constructed and arranged to pattern the projection beam according to a desired pattern; a substrate table to hold a substrate; and a projection system to project the patterned beam onto a target portion of the substrate, said radiation system further comprising: a beam delivery system comprising redirecting elements to redirect said beam along a beam path that extends from a radiation source to an illumination systems, wherein said radiation source is arranged to provide a beam having a predetermined polarization state and said redirecting elements are arranged to provide a minimum polarization related radiation loss, and wherein said beam delivery system is constructed and arranged to maintain the predetermined polarization state relative to each of said redirecting elements, said redirecting elements disposed along said beam path such that a plane of incidence of at least one of said redirecting elements intersects a plane of incidence of at least another one of said redirecting elements.