title: Serrodyne optical frequency shifting for heterodyne self-mixing in a distributed-feedback fiber laser.
abstract: We describe an all-fiberized coherent detection system at 1.55 microm using heterodyne self-mixing modulation in a distributed-feedback fiber laser. Frequency shifting of the optical feedback is based on serrodyne phase modulation with an integrated electro-optic modulator, which is a significant advance in the simplification of the self-mixing detection scheme for class B lasers. Accurate measurement of the optical phase difference between the laser electric field and the backscattered electric field demonstrates nanometric displacement detection on noncooperative targets.
authors.affiliation: Equipe Lasers, Instrumentation Optique et Applications (LIOA)-Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252 CEA-CNRS-ENSICAEN, Université de Caen, France. mathieu.laroche@ensicaen.fr
authors.forename: Mathieu
authors.initials: M
authors.lastname: Laroche
authors.forename: Célia
authors.initials: C
authors.lastname: Bartolacci
authors.forename: Guillaume
authors.initials: G
authors.lastname: Lesueur
authors.forename: Hervé
authors.initials: H
authors.lastname: Gilles
authors.forename: Sylvain
authors.initials: S
authors.lastname: Girard