Spatial Beam Cleaning in Multimode GRIN Fibers: Polarization Effects

Year: 2023

Authors: Ferraro M., Mangini F., Zitelli M., Jauberteau R., Sun YF., Parra-Rivas P., Krupa K., Tonello A., Couderc V., Wabnitz S.

Autors Affiliation: Sapienza Univ Rome, Dept Informat Engn Elect & Telecommun DIET, I-00184 Rome, Italy; Univ Calabria, Phys Dept, I-87036 Arcavacata Di Rende, Italy; Polish Acad Sci, Inst Phys Chem, PL-01224 Warsaw, Poland; Univ Limoges, XLIM Inst, CNRS, UMR 7252, F-87060 Limoges, France; Ist Nazl Ottica, CNR INO, I-80078 Pozzuoli, Italy.

Abstract: The beam self-cleaning effect in graded-index multimode optical fibers has several interesting potential applications, such as high-resolution nonlinear imaging and mode-locked fiber lasers. Most experimental and theoretical studies of beam self-cleaning have neglected the role of the state of polarization of light. In this work, we fill this gap by reporting extensive experimental investigations of beam self-cleaning in multimode fibers, for beams with different input states of light polarization. We found that the state of polarization undergoes a complex evolution, which may lead either to full conservation of the input state of polarization, or to nearly complete light depolarization at the fiber output. The former outcome is compelling for applications based on the beam self-cleaning effect, such as multimode mode-locked fiber lasers for micromachining, and multimode devices for microscopy and endoscopy. The latter result, instead, permits to test the limits of validity of current purely scalar theoretical approaches for describing nonlinear propagation in multimode fibers.

Journal/Review: IEEE PHOTONICS JOURNAL

Volume: 15 (5)      Pages from: 3000906-1  to: 3000906-6

More Information: This work was supported in part by EU HORIZON2020 ERC under Grant 740355, in part by MSCA under Grants 713694,101064614, and 101023717, in part by the Italian Ministry of University and Research under Grant R18SPB8227, in part by Sapienza University under Grant RG12117A84DA7437, in part by European Union under the NRRP of NextGen erationEU, partnership on Telecommunications of the Future under Grant PE00000001 – RESTART, and in part by French Research National Agency under Grants ANR-18-CE080016-01 and ANR-10-LABX-0074-01.(Fabio Mangini and Mario Ferraro contributed equally to this work.)
KeyWords: Kerr effect; multimode fibers; nonlinear optics; polarization of light; self-cleaning
DOI: 10.1109/JPHOT.2023.3318266

Citations: 2
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