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

被引：64

作者：

Hansson, Tobias ^{[1
]}

Tonello, Alessandro ^{[2
]}

Mansuryan, Tigran ^{[2
]}

Mangini, Fabio ^{[3
]}

Zitelli, Mario ^{[4
]}

Ferraro, Mario ^{[4
]}

Niang, Alioune ^{[3
]}

Crescenzi, Rocco ^{[4
]}

Wabnitz, Stefan ^{[4
,5
]}

Couderc, Vincent ^{[2
]}

机构：

[1] Linkoping Univ, Dept Phys Chem & Biol, SE-58183 Linkoping, Sweden

[2] Univ Limoges, XLIM, UMR CNRS 7252, 123 Ave A Thomas, F-87060 Limoges, France

[3] Univ Brescia, Dipartimento Ingn Informaz, Via Branze 38, I-25123 Brescia, Italy

[4] Sapienza Univ Rome, Dipartimento Ingn Informaz Elettron & Telecomunic, Via Eudossiana 18, I-00184 Rome, Italy

[5] Novosibirsk State Univ, Pirogova 1, Novosibirsk 630090, Russia

来源：

OPTICS EXPRESS | 2020年 / 28卷 / 16期

基金：

欧洲研究理事会; 瑞典研究理事会;

关键词：

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

D O I：

10.1364/OE.398531

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：24005 / 24021

页数：17

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