Patent ID: 9581811
Date: 2017-02-28
CPC Classifications: G01M,G02B,G03F

Claim:
1. An adjustment method of an illumination optical system, the illumination optical system illuminating an irradiation target surface by light from a light source and supplying illumination light to an image-forming optical system that forms an image of a pattern placed on a first plane on a second plane, the method comprising: adjusting a pupil luminance distribution to be formed on an illumination pupil of the illumination optical system; and changing the pupil luminance distribution to be formed on the illumination pupil, with the adjusted pupil luminance distribution serving as a target, wherein the adjusting comprises: the evaluation method includes: the adjusting further comprises: by repeatedly performing the process of acquiring the unit change amount of the index value for each unit pupil area, the process of acquiring the discrete data modulated and the process of acquiring the index value until a difference between the index value obtained corresponding to the modulated discrete data and the target index value falls within a permissible range, the pupil luminance distribution to be formed on the illumination pupil is adjusted.