Patent ID: 7161681
Filing Date: 2007-01-09
Classification: G01J,G01M

Abstract:
1. An aberration measuring apparatus which measures aberration of an optical system to be analyzed using light having substantially the same wavelength as the wavelength used in said optical system to be analyzed, comprising: a light source which emits light having a near-infrared wavelength; a wavelength transformer which transforms light from the light source to light having substantially the same wavelength as the wavelength used; an interferometer which causes the light from said wavelength transformer to enter the optical system to be analyzed and measures aberration of said optical system to be analyzed; and a wavelength calibrating means for calibrating the wavelength of the light from said light source, wherein said wavelength calibrating means further comprises phase modulating means and carries out wavelength calibration of said light using a band wave generated by carrying out phase modulation on the light having the wavelength subject to said wavelength calibration.