High-temperature wave thermalization spoils beam self-cleaning in nonlinear multimode GRIN fibers

Year: 2023

Authors: Mangini F., Ferraro M., Tonello A., Couderc V., Wabnitz S.

Autors Affiliation: Sapienza Univ Rome, Dept Informat Engn Elect & Telecommun, Via Eudossiana 18, I-00184 Rome, Italy; Univ Limoges, XLIM, UMR CNRS 7252, 123 Ave A Thomas, F-87060 Limoges, France; Ist Nazl Ottica, CNR INO, Via Campi Flegrei 34, I-80078 Pozzuoli, Italy.

Abstract: In our experiments, we reveal a so-far unnoticed power limitation of beam self-cleaning in graded-index nonlinear multimode optical fibers. As the optical pulse power is progressively increased, we observed that the initial Kerr-induced improvement of the spatial beam quality is eventually lost. Based on a holographic mode decomposition of the output field, we show that beam spoiling is associated with high-temperature wave thermalization, which depletes the fundamental mode in favor of a highly multimode power distribution. (c) 2023 Optica Publishing Group

Journal/Review: OPTICS LETTERS

Volume: 48 (18)      Pages from: 4741  to: 4744

More Information: European Research Council (740355) ; Ministero dell’Universita e della Ricerca (PE00000001, R18SPB8227) ; Sapienza Universita di Roma(AR2221815ED243A0, RG12117A84DA7437) ; Agence Nationale de la Recherche (10-LABX-0074-01, 18-CE080016-01) .r (AR2221815ED243A0, RG12117A84DA7437) ; Agence Nationale de la Recherche (10-LABX-0074-01, 18-CE080016-01) .
KeyWords: Mode
DOI: 10.1364/OL.497917

Citations: 2
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