Patent ID: 6693704
Filing Date: 2004-02-17
Classification: G01J,G01M,G03F

Abstract:
An apparatus for measuring a wave front aberration comprising:at least one of a light source and an element that produces a first point source in combination with the light source and that is removably/movably arranged and a first point source generating part; a holding mechanism that holds a test object; a magnifying projection optical system that projects and enlarges a point image of the first point source projected by a test object; a detector that detects the magnified point image projected and magnified by the magnifying projection optical system; a supporting member that supports the magnifying projection optical system and the detector and that can be moved along the optical axis and in a plane perpendicular to the optical axis; a calculating part that calculates a wave front aberration by means of a phase retrieve algorithm based on a point-spread function detected by the detector and known information input in advance; and at least one of a second point source producing element that is removably/movably arranged and that produces a second point source on the image plane of the test object by means of the test object in combination with any one of the light source, the light source and the element, the first point source generating part, and a second point source generating part that produces the second point source on the image plane of the test object and that is removably or movably arranged.