Patent ID: 8164739
Filing Date: 2012-04-24
Classification: G03B,G03F

Abstract:
1. An optical apparatus for controlling fluctuations in one or more of a beam pointing error, a beam positioning error, a beam size error or a beam divergence error of a beam of light in a lithography system, the optical apparatus comprising: a first beam control module having a first optics in an optical axis for optically isolating a laser pulse from a light source associated with an illuminator to provide the beam of light, the first beam control module configured to selectively stabilize at least one of the beam pointing error, beam positioning error, beam size error or beam divergence error by homogenizing selectively one of spatial field or angular information of a given illumination profile for the beam of light and symmetrizing the other one of the spatial field or angular information, which is not being homogenized, based on a first arrangement of the first optics or homogenizing and symmetrizing both of the spatial field and angular information based on a second arrangement of the first optics.