title: Coherence properties of two fiber lasers coupled by mutual injection.
abstract: Phase locking of two fiber lasers is obtained by mutual injection. The coherence properties of this composite laser are analyzed. In the most general case, the radiations at the two output mirrors of the laser are not mutually coherent. The cross-correlation of the two emitted beams shows that an extra-cavity delay line is required to get stable and high visibility interference fringes. Such a laser configuration is attractive for coherent beam combining in the far field provided the multiple output beams are properly time delayed.
authors.affiliation: XLIM, UMR CNRS 6172, 123 Avenue A. Thomas, 87060 Limoges Cedex, France. Sandrine.auroux@xlim.fr
authors.forename: Sandrine
authors.initials: S
authors.lastname: Auroux
authors.forename: Vincent
authors.initials: V
authors.lastname: Kermène
authors.forename: Agnès
authors.initials: A
authors.lastname: Desfarges-Berthelemot
authors.forename: Alain
authors.initials: A
authors.lastname: Barthélémy
mesh_terms: D000669:Amplifiers, Electronic; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007368:Interferometry / Q000295:instrumentation*; D007834:Lasers; D009991:Oscillometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity