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

Результат исследования: Научные публикации в периодических изданияхстатья

Аннотация

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.

Язык оригиналаанглийский
Страницы (с-по)24005-24021
Число страниц17
ЖурналOptics Express
Том28
Номер выпуска16
DOI
СостояниеОпубликовано - 3 авг 2020

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