Modal phase-locking in multimode nonlinear optical fibers

被引：4

作者：

Mangini, Fabio ^{[1
]}

Ferraro, Mario ^{[1
]}

Sun, Yifan ^{[1
]}

Gervaziev, Mikhail ^{[1
,2
,3
]}

Parra-Rivas, Pedro ^{[1
]}

Kharenko, Denis S. ^{[2
,3
]}

Couderc, Vincent ^{[4
]}

Wabnitz, Stefan ^{[1
,5
]}

机构：

[1] Sapienza Univ Rome, Dept Informat Engn Elect & Telecommun, Via Eudossiana 18, I-00184 Rome, Italy

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

[3] SB RAS, Inst Automation & Electrometry, Novosibirsk 630090, Russia

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

[5] Ist Nazl Ottica, CNR INO, Via Campi Flegrei 34, I-80078 Pozzuoli, Italy

来源：

OPTICS LETTERS | 2023年 / 48卷 / 14期

基金：

欧洲研究理事会; 欧盟地平线“2020”;

关键词：

POLARIZATION INSTABILITIES;

D O I：

10.1364/OL.494543

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Spatial beam self-cleaning, a manifestation of the Kerr effect in graded-index multimode fibers, involves a nonlinear transfer of power among modes, which leads to robust bell-shaped output beams. The resulting mode power distribution can be described by statistical mechanics arguments. Although the spatial coherence of the output beam was experimentally demonstrated, there is no direct study of modal phase evolutions. Based on a holographic mode decomposition method, we reveal that nonlinear spatial phase-locking occurs between the fundamental and its neighboring low-order modes, in agreement with theoretical predictions. As such, our results dispel the current belief that the spatial beam self-cleaning effect is the mere result of a wave thermalization process. (c) 2023 Optica Publishing Group

引用

页码：3677 / 3680

页数：4

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