Patent ID: 9174385
Filing Date: 2015-11-03
Classification: B23K,B29C,F21V,G03F

Abstract:
1. Method for modifying in a spatially periodic manner at least in some regions a surface of a substrate ( 24 ), said surface being disposed on a sample plane (P) by acting upon different regions ( 211 , 221 , 231 , 232 ) of the substrate surface successively with a spatially periodic illumination pattern of an energy density above a processing threshold of the substrate surface, where the illumination pattern is generated by diffraction of an input beam ( 10 ) and superimposition of resulting, diffracted sub-beams ( 12 , 14 ) by means of a grid interferometer ( 100 ), and where, in order to select the respective substrate surface region to be illuminated ( 211 , 221 , 231 , 232 ), the input beam ( 10 ) is deviated by means of a beam-deviating unit ( 16 ) arranged upstream of the grid interferometer ( 100 ), wherein the input beam ( 10 ) passes through an F-Theta lens ( 22 ) between the beam-deviating unit ( 16 ) and the grid interferometer ( 100 ).