Numerical analysis of beam self-cleaning in multimode fiber amplifiers

Year: 2022

Authors: Jima M.A., Tonello A., Niang A., Mansuryan T., Krupa K., Modotto D., Cucinotta A., Couderc V., Wabnitz S.

Autors Affiliation: Univ Brescia, Dipartimento Ingn Informaz, Via Branze 38, I-25123 Brescia, Italy; Univ Limoges, XLIM, UMR CNRS 7252, 123 Av A Thomas, F-87060 Limoges, France; Sapienza Univ Roma, Dipartimento Ingn Informaz Elettron & Telecomunic, Via Eudossiana 18, I-00184 Rome, Italy; Univ Maryland, Comp Sci & Elect Engn Dept, Baltimore, MD 21250 USA; Polish Acad Sci, Inst Phys Chem, Ul Kasprzaka 44-52, PL-01224 Warsaw, Poland; Univ Parma, Dipartimento Ingn & Architettura, Parco Area Sci 181-A, I-43124 Parma, Italy; CNR INO, Ist Nazl Ott, Via Campi Flegrei 34, I-80078 Pozzuoli, NA, Italy.

Abstract: Recent experimental results have reported the observation of beam self-cleaning or, more generally, nonlinear beam reshaping in active multimode fibers. In this work, we present a numerical analysis of these processes by considering the ideal case of a diode-pumped signal amplifier made of a graded-index multimode fiber with uniform Yb doping. Simulations confirm that beam cleaning of the signal may take place even in amplifying fibers, in the absence of beam power conservation. Moreover, we show how the local signal intensity maxima, which are periodically generated by the self-imaging process, may influence the population inversion of the doping atoms, and locally saturate the amplifier gain.

Journal/Review: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS

Volume: 39 (8)      Pages from: 2172  to: 2180

More Information: ArianeGroup (CILAS X-LAS); H2020 European Research Council (740355); Narodowa Agencja Wymiany Akademickiej (BPN/BFR/2021/1/00013); Campus France (48161TH).
KeyWords: pulse-propagation; interference; dynamics; impact; lasers
DOI: 10.1364/JOSAB.463473

Citations: 6
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