Patent ID: 7167251
Filing Date: 2007-01-23
Classification: G01B,G01M,G01N

Abstract:
1. A method of processing an optical substrate having a convex first surface and a second surface opposite the first surface, the method comprising: generating a diverging first measuring light beam using a first interferometer optics, the first measuring light beam having a portion of a beam path thereof where the first measuring light beam is a diverging beam; arranging the optical substrate in the first measuring light beam in the portion of the beam path thereof where the first measuring light beam is the diverging beam, with the second surface of the optical substrate facing towards the first interferometer optics; interferometrically taking a first measurement by superimposing first wavefronts generated by the first measuring light beam having traversed the optical substrate with second wavefronts not interacting with the first surface; determining deviations of the first surface of the optical substrate from a target shape thereof in dependence on the first measurement; and processing the first surface of the optical substrate in dependence on the determined deviations.