Open AccessDigital holography for coherent fiber beam combining with a co-propagative scheme
Author(s) -
Marie Antier,
Christian Larat,
Éric Lallier,
Jérôme Bourderionnet,
Jérôme Primot,
A. Brig
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.023310
Subject(s) - digital holography , optics , holography , phase (matter) , beam (structure) , reference beam , diffraction , optical fiber , residual , materials science , physics , computer science , algorithm , quantum mechanics
We present a technique for passive coherent fiber beam combining based on digital holography. In this method, the phase errors between the fibers are compensated by the diffracted phase-conjugated -1 order of a digital hologram. Unlike previous digital holography technique, the probe beams measuring the phase errors between the fibers are co-propagating with the phase-locked signal beams. This architecture is compatible with the use of multi-stage isolated amplifying fibers. It does not require any phase calculation algorithm and its correction is collective. This concept is experimentally demonstrated with three fibers at 1.55 μm. A residual phase error of λ/20 is measured.