Patent ID: 9366970
Filing Date: 2016-06-14
CPC Classification: G02B,G03F

Claim Text:
1. A method of configuring an illumination optical system used in an exposure apparatus, the illumination optical system being arranged to illuminate an object with light and comprising a distributing optical system which forms a predetermined light intensity distribution on an illumination pupil of the illumination optical system and which includes a first optical system arranged in an optical path of the light and an optical integrator arranged in the optical path on an exit side of the first optical system, the method comprising a step of: replacing the first optical system with a second optical system according to a control signal from a control system, wherein the first optical system comprises one of a spatial light modulator and a diffractive optical element arranged in the optical path, and wherein the second optical system comprises the other of the spatial light modulator and the diffractive optical element in the optical path.