Patent ID: 6312373
Filing Date: 2001-11-06
Classification: G01B,G01M,G03F

Abstract:
A method of manufacturing a projection optical system capable of projecting a pattern from a reticle onto a photosensitive substrate, comprising the steps of:a. measuring a shape of a test surface of an optical element that is a component of the projection optical system by causing interference between light from said test surface and light from an aspheric reference surface while said test surface and said aspheric reference surface are held integrally and in close proximity to one another;b. assembling said optical element in the projection optical system and measuring the wavefront aberration of the projection optical system;c. determining an amount by which said shape of said test surface should be corrected based on said measured wavefront aberration obtained in said step b; andd. correcting said shape of said test surface based on said amount by which said shape of said test surface should be corrected as determined in said step c.