Patent ID: 6178002
Filing Date: 2001-01-23
Classification: G01J,H01S

Abstract:
A method of laser frequency measurement and frequency stabilization by means of an interferometer on the basis of the generation of two quadrature signals shifted in phase by 90.degree., the method comprising the following steps:generating first and second component beams which are separated spatially or by their polarization characteristics;striking the interferometer with the first and second component beams so that the first and second component beams pass through or are reflected by the interferometer;detecting the first and second component beams to produce first and second measured electronic signals;measuring the laser frequency; andstabilizing the laser frequency,wherein the transmitted or reflected component beams being detected and with phase shifts of the measured signals by 90.degree. being created by the different lengths of optical paths in the interferometer, wherein the differences of the path lengths of the component beams are created in the interferometer by different angles of incidence of the two component beams relative to an interferometer axis or by different continuously variable optical thicknesses of the interferometer for the two component beams.