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 confirmthat 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. (C) 2022 Optica Publishing Group
Numerical analysis of beam self-cleaning in multimode fiber amplifiers / Jima, M. A.; Tonello, A.; Niang, A.; Mansuryan, T.; Krupa, K.; Modotto, D.; Cucinotta, A.; Couderc, V.; Wabnitz, S.. - In: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. B, OPTICAL PHYSICS. - ISSN 0740-3224. - 39:8(2022), pp. 2172-2180. [10.1364/JOSAB.463473]
Numerical analysis of beam self-cleaning in multimode fiber amplifiers
Modotto D.
Membro del Collaboration Group
;Cucinotta A.Membro del Collaboration Group
;
2022-01-01
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 confirmthat 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. (C) 2022 Optica Publishing GroupI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
