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Collective phase measurement of an array of fiber lasers by quadriwave lateral shearing interferometry for coherent beam combining.

Authors
  • Bellanger, C
  • Toulon, B
  • Primot, J
  • Lombard, L
  • Bourderionnet, J
  • Brignon, A
Type
Published Article
Journal
Optics Letters
Publisher
The Optical Society
Publication Date
Dec 01, 2010
Volume
35
Issue
23
Pages
3931–3933
Identifiers
DOI: 10.1364/OL.35.003931
PMID: 21124569
Source
Medline
License
Unknown

Abstract

We present a new configuration of quadriwave lateral shearing interferometer dedicated to phase detection for beam-combining purposes. Assuming that the fibers are disposed in a matrix arrangement, our scheme gives direct access to the phase step between adjacent fibers in two dimensions. Experimentally recorded interferograms are made only of two-wave interference fringes that scroll as the phase evolves in the fibers. This simplicity allows fast treatment by the spatial demodulation process, and the phase map from the fibers can be estimated in real time. No external reference is required, and the technique is fully compatible with a high number of fibers.

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