Patent ID: 7602502
Filing Date: 2009-10-13
Classification: G01B,G01M

Abstract:
1. A method of manufacturing an optical element having an optical surface of a non-rotationally symmetric shape, the method comprising: generating measuring light using an interferometer optics, wherein the interferometer optics comprises at least one diffractive component having a grating, positioning the optical surface at a first position relative to the at least one diffractive component, wherein first measuring light diffracted at the diffractive component is incident on the optical surface at plural locations thereof, and detecting at least one first interference pattern generated from first measuring light reflected from the optical surface; positioning the optical surface at a second position relative to the at least one diffractive component, wherein second measuring light diffracted at the diffractive component is incident on the optical surface at plural locations thereof, and detecting at least one second interference pattern generated from second measuring light reflected from the optical surface, wherein the grating provides at least a first phase function and a second phase function.