LITHOGRAPHIC APPARATUS AND DEVICE MANUFACTURING METHOD

摘要

The invention relates to a lithographic apparatus comprising an optical column capable of creating a pattern on a target portion of the substrate. The optical column may be provided with a self-emissive contrast device configured to emit a beam and a projection system configured to project the beam onto the target portion. The apparatus may be provided with an actuator to move the optical column or a part thereof with respect to the substrate. An optical sensor device is provided which is movable in respect of the optical columns and has a range of movement which enables the optical sensor device (936) to move through a projection area (940) of each of the optical columns to measure a beam of each of the optical columns.