Patent ID: 6590655
Filing Date: 2003-07-08
Classification: G01J,G01N,G02B

Abstract:
A reflectometer, spectrophotometer, polarimeter or ellipsometer system for application in non-destructive investigation of sample systems, comprising:source of electromagnetic radiation; means for effecting cross-sectional, essentially radially uniform energy density in electromagnetic beams, said means for effecting cross-sectional, essentially radially uniform energy density in electromagnetic beams comprising a sequential combination of: beam expander; first beam collimator; at least one multi-faceted optical element; beam condenser; and second beam collimator; stage for supporting a sample system; and detector; such that in use electromagnetic radiation of arbitrary cross-sectional radial energy density is provided by said source of electromagnetic radiation and is caused to pass through said means for effecting cross-sectional, essentially radially uniform energy density in electromagnetic beams such that a beam of substantially radially uniform energy density is output therefrom, is caused to approach at other than a normal angle to a surface of, and interact with a sample system placed on said stage for supporting a sample system, and then enter said detector.