Patent ID: 6671035
Filing Date: 2003-12-30
Classification: G03F

Abstract:
A lithographic projection apparatus comprising:a projection beam radiation system which provides a projection beam of radiation, said radiation system including an adjustable intensity distributing illumination system which defines the intensity distribution of the projection beam at a plane, the illumination system adapted to control at least one of an inner and an outer radial extent of the said intensity distribution; a projection beam controller which patterns the projection beam according to a desired pattern; a substrate table for holding a substrate; and a beam projection system which images the patterned beam onto a target portion of the substrate, wherein the illumination system includes at least one exchanger which removably inserts at least one of a plurality of optical elements into and out of the projection beam path, each of the said optical elements defining at least one parameter of said intensity distribution, and wherein at least one optical element comprises at least one of diffractive and refractive elements.