Multimode Optical Fiber Beam-By-Beam Cleanup

We introduce and experimentally demonstrate the concept of all-optical beam switching in graded-index multimode optical fibers. Nonlinear coupling between orthogonally polarized seed and signal beams permits to control the spatial beam quality at the fiber output. Remarkably, we show that even a few...

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Bibliographic Details
Published in:Journal of lightwave technology 2023-05, Vol.41 (10), p.1-11
Main Authors: Ferraro, Mario, Mangini, Fabio, Leventoux, Yann, Tonello, Alessandro, Zitelli, Mario, Mansuryan, Tigran, Sun, Yifan, Fevrier, Sebastien, Krupa, Katarzyna, Kharenko, Denis, Wabnitz, Stefan, Couderc, Vincent
Format: Article
Language:English
Subjects:
Beam switching
Engineering Sciences
Fiber lasers
Fiber nonlinear optics
Laser beams
Multimode fibers
Nonlinear Sciences
Optical beams
Optical fiber communication
Optical fiber polarization
Optical fibers
Optical switch
Optical switches
Optical switching
Optical transistor
Optics
Photonic
Spatial beam self-cleaning
Ultrafast optics
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Summary:We introduce and experimentally demonstrate the concept of all-optical beam switching in graded-index multimode optical fibers. Nonlinear coupling between orthogonally polarized seed and signal beams permits to control the spatial beam quality at the fiber output. Remarkably, we show that even a few-mode control beam whose power is about ten times lower than that of the total beam may substantially enhance the quality of an intense, highly multimode signal beam. We propose a simple geometrical representation of the beam switching operation, whose validity is quantitatively confirmed by the experimental mode decomposition of the output beam. All-optical switching of multimode beams may find important applications in high-power beam delivery and fiber lasers.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2023.3239385