Patent ID: 6658084
Filing Date: 2003-12-02
Classification: B82Y,G03F,G21K

Abstract:
An illumination system for wavelengths &lE;193 nm, comprising:a first optical element upon which a light beam from a light source impinges, said first optical element having a first plurality of raster elements that partition said light beam into a plurality of light channels; p1 a second optical element that receives said plurality of light channels, said second optical element having a second plurality of raster elements; an object plane that receives said plurality of light channels via said second optical element; and an exit pupil that is provided with an illumination via said object plane, wherein said illumination system is characterized by an assignment of a member of said first plurality of raster elements and a member of said second plurality of raster elements to each of said plurality of light channels to provide a continuous beam path from said first optical element to said object plane for each of said plurality of light channels, and wherein said assignment is changeable to provide an adjustment of said illumination in said exit pupil.