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公开(公告)号:US20220291598A1
公开(公告)日:2022-09-15
申请号:US17770575
申请日:2020-09-28
Applicant: ASML Holding N.V.
Inventor: Krishanu SHOME , Igor Petronella AARTS , Junwon LEE
Abstract: An apparatus for and method of sensing alignment marks in which a self-referencing interferometer based sensor outputs standing images of the alignment marks and camera device is used to capture the images as output by the sensor and a detector is used to obtain phase information about the alignment marks from the images as output by the sensor.