Patent ID: 8416390
Filing Date: 2013-04-09
Classification: G03F

Abstract:
1. An illumination system having an optical axis and a pupil surface, the illumination system comprising: an array comprising deflection elements, each deflection element being reflective or transparent, each deflection element configured to deflect an impinging light ray by a deflection angle that can be varied, and the deflection elements being at least substantially arranged in a first plane; an optical raster element comprising a plurality of microlenses and/or diffractive structures, the optical raster element being arranged in a second plane, the array and the optical raster element being configured to commonly produce a two-dimensional far field intensity distribution in the pupil surface, the pupil surface being different from both the first plane and the second plane; an optical integrator arranged in or in close proximity to the pupil surface, the optical integrator being configured to produce a plurality of secondary light sources; and an optical imaging system that optically conjugates the first plane to the second plane, wherein the illumination system is configured to illuminate a mask in a microlithography exposure apparatus.