title: Single-frequency external-cavity semiconductor    ring-laser gyroscope.
abstract: We report for the first time (to our knowledge) the experimental achievement of a single-frequency ring-laser gyroscope using a diode-pumped half-vertical-cavity semiconductor-emitting laser structure as a gain medium. Thanks to the control of mode competition by an active feedback loop, we observe a beat signal from recombined beams that has a frequency proportional to the rotation rate as predicted by the Sagnac effect. This promising result opens new perspectives for rotation sensing.
authors.affiliation: Thales Research and Technology France, RD 128, Palaiseau Cedex, France.
authors.forename: Augustin
authors.initials: A
authors.lastname: Mignot
authors.forename: Gilles
authors.initials: G
authors.lastname: Feugnet
authors.forename: Sylvain
authors.initials: S
authors.lastname: Schwartz
authors.forename: Isabelle
authors.initials: I
authors.lastname: Sagnes
authors.forename: Arnaud
authors.initials: A
authors.lastname: Garnache
authors.forename: Claude
authors.initials: C
authors.lastname: Fabre
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Pocholle