Serrodyne optical frequency shifting for heterodyne self-mixing in a distributed-feedback fiber laser.
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.
Laroche
Mathieu
M
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
Bartolacci
Célia
C
Lesueur
Guillaume
G
Gilles
Hervé
H
Girard
Sylvain
S