GRATING INTERFEROMETRY WITH A SEMICONDUCTOR LIGHT-SOURCE

The properties of a fiber-optic-based grating interferometer with a la ser diode as the light source are described. The influence of effects such as wavelength shift, Line broadening, and made hopping on the qua lity of an interference pattern is investigated both theoretically and experimentally. Introduction of carrier fringes in the interference p attern through the injection-current-induced modulation of a laser dio de is shown. The requirements for temporal coherence properties of a l ight source in grating interferometry are given. (C) 1997 Optical Soci ety of America.