Nonlinear beam self-imaging and self-focusing dynamics in a GRIN multimode optical fiber: Theory and experiments

Tobias Hansson, Alessandro Tonello, Tigran Mansuryan, Fabio Mangini, Mario Zitelli, Mario Ferraro, Alioune Niang, Rocco Crescenzi, Stefan Wabnitz, Vincent Couderc

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Beam self-imaging in nonlinear graded-index multimode optical fibers is of interest for many applications, such as implementing a fast saturable absorber mechanism in fiber lasers via multimode interference. We obtain a new exact solution for the nonlinear evolution of first and second order moments of a laser beam of arbitrary transverse shape carried by a graded-index multimode fiber. We have experimentally directly visualized the longitudinal evolution of beam self-imaging by means of femtosecond laser pulse propagation in both the anomalous and the normal dispersion regime of a standard telecom graded-index multimode optical fiber. Light scattering out of the fiber core via visible photo-luminescence emission permits us to directly measure the self-imaging period and the beam dynamics. Spatial shift and splitting of the self-imaging process under the action of self-focusing are also revealed.

Original languageEnglish
Pages (from-to)24005-24021
Number of pages17
JournalOptics Express
Volume28
Issue number16
DOIs
Publication statusPublished - 3 Aug 2020

Keywords

  • SINGLE-MODE FIBER
  • SATURABLE ABSORBER
  • PULSE-PROPAGATION
  • LASER
  • INTERFERENCE
  • INSTABILITY
  • IMPACT
  • LIGHT

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