title: Digital phase-measuring interferometry with a tunable laser diode.
abstract: A digital phase-measuring interferometer with a laser-diode source has been developed that is based on a fringe-scanning technique with a stepwise wavelength change by variation of the laser injection current. The phase is changed to produce a relative phase difference between the beams in the two arms of the interferometer. Calibrated phase shifts used for a phase-extraction algorithm are derived from one-dimensional least-squares fits to cosine fringe functions to achieve accurate results. Experimental results are presented.
authors.forename: Y
authors.initials: Y
authors.lastname: Ishii
authors.forename: J
authors.initials: J
authors.lastname: Chen
authors.forename: K
authors.initials: K
authors.lastname: Murata