Patent ID: 7719691

Claim:
A wavefront measuring apparatus for optical pickup comprising: a beam splitting section that splits a light beam output from an optical pickup apparatus into a first beam for inspection and a second beam for reference beam generation; a wavefront shaping section that shapes a wavefront of the second beam to convert the second beam into a reference beam; a beam combining section that combine the first beam and the reference beam to generate interference light; an interference fringe image-acquiring section that acquires an interference fringe image including wavefront information of the light beam on the basis of the interference light; and an analyzing section that analyzes a wavefront of the light beam on the basis of the interference fringe image, wherein the light beam includes a main beam and a sub beam for a tracking adjustment, and the analyzing section includes: an image processing section that performs a filtering process on the interference fringe image to eliminate a frequency component corresponding to the sub beam, so as to acquire the filtering-processed interference fringe image, and a wavefront analyzing section that analyzes a wavefront of the main beam on the basis of the filtering-processed interference fringe image.