Patent ID: 9151718
Filing Date: 2015-10-06
Classification: G01N

Abstract:
1. An illumination system for reticle inspection, comprising: a plurality of illumination sources, wherein at least one of the illumination sources is an extreme ultraviolet (EUV) illumination source; a multiplexing mirror system configured to at least receive pulses of EUV illumination from the plurality illumination sources, and further configured to direct the pulses of EUV illumination along an illumination path; a plurality of field mirror facets, at least some of the field mirror facets configured to receive a portion of EUV illumination from the illumination path; and a plurality of pupil mirror facets, at least some of the pupil mirror facets configured to receive a portion of EUV illumination reflected from the plurality of field mirror facets, and further configured to direct the portion of EUV illumination received from the plurality of field mirror facets along a delivery path to a reticle.