Patent ID: 8264667

Claim:
A lithographic apparatus for exposing a pattern on a substrate, comprising: a substrate support that is configured to support a substrate; an exposure unit that is configured to project two beams of pulsed radiation onto the substrate, such that each of the two beams of pulsed radiation interfere with each other to produce a series of separate exposures comprising a first exposure during a first exposure period and a second exposure during a second exposure period, the first and second exposure periods being successive, to expose a first set of parallel lines whereby a first target area of a plurality of target areas is exposed during the first exposure period and a second target area of the plurality of target areas is exposed during the second exposure period on the substrate during each pass across the substrate, each of the first and second target areas being in an area smaller than a width of the substrate; and an actuator that is configured to continuously move the substrate support relative to the exposure unit during exposure of the parallel lines on the first and second target areas of the substrate, wherein during a third exposure period to expose a second set of parallel lines, only, one of the second set of parallel lines overlaps and aligns with only one of the parallel lines of the first set of parallel lines.