Patent ID: 7999939

Claim:
A lithographic apparatus, comprising: a partitioning device configured to receive and partition a radiation beam into a plurality of radiation beams; a plurality of light sources configured to generate a corresponding plurality of alignment beams; a plurality of sensors configured to provide a measurement of at least one of an angle, a position, or an energy distribution of the plurality of alignment beams, wherein each of the sensors in the plurality of sensors is spaced apart from one another and wherein each of the sensors in the plurality of sensors corresponds to each of the alignment beams in the plurality of alignment beams; an array of individually-controllable elements configured to correct the plurality of radiation beams in response to the measurement by the plurality of sensors; an adjustable patterning device positioned optically downstream of the array of individually-controllable elements, wherein the adjustable patterning device is configured to pattern the corrected plurality of radiation beams based on the measurement; and a projection system configured to project the patterned plurality of radiation beams from the adjustable patterning device onto a target portion of a substrate.