Patent ID: 7486379
Filing Date: 2009-02-03
Classification: G03F

Abstract:
1. An exposure apparatus for exposing a substrate to light via an original plate, the apparatus comprising: a projection optical system configured to project a pattern of the original plate onto the substrate; a liquid immersion mechanism configured to generate a liquid immersion state in which a gap between the final surface of the projection optical system and the substrate is filled with liquid; a first photosensor configured to detect light which has passed through the projection optical system; a second photosensor different from the first photosensor and configured to detect light that has passed through the projection optical system; and a controller configured to calibrate an output from the first photosensor in the liquid immersion state based on a first output from the first photosensor in the liquid immersion state, a second output from the first photosensor in a non-liquid immersion state, and a third output from a reference illuminometer for detecting light which has passed through the projection optical system in the non-liquid immersion state, and to calibrate an output from the second photosensor in the liquid immersion state based on the calibrated output from the first photosensor in the liquid immersion state and an output from the second photosensor in the liquid immersion state.