Patent ID: 6704095
Filing Date: 2004-03-09
Classification: G02B,G03F,Y10S

Abstract:
An illumination system for a projection exposure system, comprising:a light source for the emission of wavelengths of &lE;193 nm; a device for producing secondary light sources, said device including a mirror having raster elements; a diaphragm plane; a first optical element for imaging said diaphragm plane in an exit pupil of the illumination system; an object plane in which images of said raster elements are substantially in line and illuminate a predetermined field with an intensity distribution; and a second optical element for producing a light distribution in said exit pupil, wherein said light distribution is specified by a parameter selected from the group consisting of type and filling degree, wherein said parameter is modified by a technique selected from the group consisting of exchanging, displacing and deforming said second optical element, wherein said raster elements are of a quantity such that a uniformity of scanning energy values is less than 10%, and wherein said scanning energy values are defined as line integrals over said intensity distribution within a predetermined field for points of said field that lie on a straight line perpendicular to a direction of integration.