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

Optics express, 2020-08, Vol.28 (16), p.24005-24021 [Peer Reviewed Journal]

ISSN: 1094-4087 ;EISSN: 1094-4087 ;DOI: 10.1364/OE.398531

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  • Title:
    Nonlinear beam self-imaging and self-focusing dynamics in a GRIN multimode optical fiber: theory and experiments
  • Author: Hansson, Tobias ; Tonello, Alessandro ; Mansuryan, Tigran ; Mangini, Fabio ; Zitelli, Mario ; Ferraro, Mario ; Niang, Alioune ; Crescenzi, Rocco ; Wabnitz, Stefan ; Couderc, Vincent
  • Is Part Of: Optics express, 2020-08, Vol.28 (16), p.24005-24021
  • Description: 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.
  • Language: English
  • Identifier: ISSN: 1094-4087
    EISSN: 1094-4087
    DOI: 10.1364/OE.398531
  • Source: GFMER Free Medical Journals
    Alma/SFX Local Collection
    SWEPUB Freely available online
    DOAJ: Directory of Open Access Journals
    ROAD: Directory of Open Access Scholarly Resources
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