Patent ID: 8629973

Claim:
A lithographic apparatus comprising: an illumination system configured to condition a radiation beam, the illumination system comprising: a uniformity correction system located at a plane configured to receive a substantially constant pupil when illuminated with the radiation beam, the uniformity correction system including: fingertips configured to be movable into and out of intersection with the radiation beam so as to correct an intensity of respective portions of the radiation beam that is incident on the fingertips, and actuating devices configured to move respective ones of the fingertips, wherein each of the respective ones, of the fingertips comprises a width that is half of the width of each of the actuating devices; a support structure configured to hold a patterning device, the patterning device configured to pattern the radiation beam; a substrate table configured to hold a substrate; and a projection system configured to project the patterned radiation beam onto a target portion of the substrate.