Patent ID: 7760326
Filing Date: 2010-07-20
Classification: G03B,G03F

Abstract:
1. An exposure apparatus for exposing a wafer to light through a pattern of a mask, said apparatus comprising: a projection optical system configured to project the pattern onto the wafer; a first barometer configured to output pressure of an atmosphere in said apparatus; a second barometer including measuring equipment that measures a refractive index of a medium using a laser beam, and configured to output the pressure based on the measured refractive index, at a speed higher than that at which said first barometer measures the pressure, the second barometer being configured to output the pressure using an equation that includes the measured refractive index as a variable, a temperature of the medium as a first constant at which said apparatus is configured to control the temperature, and humidity of the medium as a second constant at which said apparatus is not configured to control the humidity, the output pressure having an error due to a fluctuation in the humidity; a calibration unit configured to calculate an offset of an output of said second barometer relative to an output of said first barometer, based on an output of said first barometer and an output of said second barometer at a predetermined interval, to calibrate an output of said second barometer based on the calculated offset, and to output the calibrated output as a measured value of the pressure; and an aberration correction unit configured to correct aberration of said projection optical system based on the calibrated output, which is output by said calibration unit.