Patent ID: 7324208
Filing Date: 2008-01-29
Classification: G01J,H04J

Abstract:
1. An optical frequency measurement apparatus that measures with high precision a fine light frequency of measured input light, comprising: a coarse light frequency measurer that computes with low precision a coarse light frequency of the measured input light based on a reference wavelength of reference light; a pulsed light source that generates pulsed light including a plurality of optical frequency components with a repetition frequency based on a reference frequency of the same reference light as used by the coarse light frequency measurer; a first beat signal generating section that generates a first beat signal having a first difference frequency that is a difference frequency between the fine light frequency and an optical frequency of the pulsed light close to the fine light frequency among the plurality of optical frequency components; a frequency measurer that measures the first difference frequency of the first beat signal; and an arithmetic section that computes the fine light frequency based on the coarse light frequency, the reference frequency, the repetition frequency, and the first difference frequency and outputs the computed fine light frequency.