Spatial beam self-cleaning in multimode fibres

Year: 2017

Authors: Krupa K., Tonello A., Shalaby B.M., Fabert M., Barthélémy A., Millot G., Wabnitz S., Couderc V.

Autors Affiliation: Univ Limoges, CNRS, UMR 7252, XLIM, 123 Ave A Thomas, F-87060 Limoges, France; Univ Bourgogne Franche Comte, ICB, CNRS, UMR 6303, 9 Ave A Savary, F-21078 Dijon, France; Tanta Univ, Fac Sci, Dept Phys, Tanta 31527, Egypt; Univ Brescia, Dipartimento Ingn Informaz, Via Branze 38, I-25123 Brescia, Italy; CNR, INO, Via Branze 38, I-25123 Brescia, Italy; Novosibirsk State Univ, 1 Pirogova Str, Novosibirsk 630090, Russia.

Abstract: Multimode optical fibres are enjoying renewed attention, boosted by the urgent need to overcome the current capacity crunch of single-mode fibre (SMF) systems and by recent advances in multimode complex nonlinear optics. In this work, we demonstrate that standard multimode fibres (MMFs) can be used as ultrafast all-optical tools for the transverse beam manipulation of high-power laser pulses. Our experimental data show that the Kerr effect in a graded-index (GRIN) MMF is the driving mechanism that overcomes speckle distortions, and leads to a counterintuitive effect that results in a spatially clean output beam robust against fibre bending. Our observations demonstrate that nonlinear beam reshaping into the fundamental mode of a MMF can be achieved even in the absence of a dissipative process such as stimulated scattering (Raman or Brillouin).

Journal/Review: NATURE PHOTONICS

Volume: 11 (4)      Pages from: 237  to: 241

More Information: K.K., A.T., B.M.S., M.F., A.B. and V.C. acknowledge the financial support provided by Bpifrance OSEO (Industrial Strategic I nnovation Programme) and Horiba Medical (Dat@diag no. I1112018W), by Region Limousin (C409-SPARC) and ANR Labex SIGMA-LIM. S.W. acknowledges support by the Italian Ministry of University and Research (MIUR) (grants 2012BFNWZ2 and 2015KEZNYM), the European Community via the Horizon 2020 CARDIALLY project and the Ministry of Education and Science of the Russian Federation (14.Y26.31.0017). G.M. acknowledges support from the iXcore research foundation, Photcom Region Bourgogne and ANR Labex Action. The authors thank F. Wise, L. Wright, Z. Liu and A. Picozzi for valuable discussions.
KeyWords: Fibers; High power lasers; Nonlinear optics; Optical fibers; Single mode fibers, Current capacity; Dissipative process; Driving mechanism; Fundamental modes; Multimode optical fibres; Non-linear beams; Stimulated scattering; Transverse beams, Multimode fibers
DOI: 10.1038/NPHOTON.2017.32

Citations: 367
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