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: Université de Limoges, XLIM, UMR CNRS 7252, 123 Avenue A. Thomas, Limoges, 87060, France; Université de Bourgogne Franche-Comté, ICB, UMR CNRS 6303, 9 Avenue A. Savary, Dijon, 21078, France; Physics Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt; Dipartimento di Ingegneria dell\’Informazione, Università di Brescia, INO-CNR, via Branze 38, Brescia, 25123, Italy; Novosibirsk State University, 1 Pirogova str., Novosibirsk, 630090, Russian Federation

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).


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

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: 351
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