Research output: Contribution to journal › Article › peer-review
Statistical mechanics of beam self-cleaning in GRIN multimode optical fibers. / Mangini, F.; Gervaziev, M.; Ferraro, M. et al.
In: Optics Express, Vol. 30, No. 7, 28.03.2022, p. 10850-10865.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Statistical mechanics of beam self-cleaning in GRIN multimode optical fibers
AU - Mangini, F.
AU - Gervaziev, M.
AU - Ferraro, M.
AU - Kharenko, D. S.
AU - Zitelli, M.
AU - Sun, Y.
AU - Couderc, V.
AU - Podivilov, E. V.
AU - Babin, S. A.
AU - Wabnitz, S.
N1 - Funding Information: Acknowledgments. We acknowledge support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant No. 740355), the Italian Ministry of University and Research (R18SPB8227), and the Russian Ministry of Science and Education Grant No. 14.Y26.31.0017. S.B., E.P., D.Kh. and M.G. were supported by Russian Science Foundation (Grant No. 21-42-00019). Funding Information: Funding. European Research Council (740355); Ministero dell’Istruzione, dell’Università e della Ricerca (R18SPB8227); Ministry of Education and Science of the Russian Federation (14.Y26.31.0017); Russian Science Foundation (21-42-00019). Publisher Copyright: © 2022 Optica Publishing Group.
PY - 2022/3/28
Y1 - 2022/3/28
N2 - Since its first demonstration in graded-index multimode fibers, spatial beam selfcleaning has attracted a growing research interest. It allows for the propagation of beams with a bell-shaped spatial profile, thus enabling the use of multimode fibers for several applications, from biomedical imaging to high-power beam delivery. So far, beam self-cleaning has been experimentally studied under several different experimental conditions. Whereas it has been theoretically described as the irreversible energy transfer from high-order modes towards the fundamental mode, in analogy with a beam condensation mechanism. Here, we provide a comprehensive theoretical description of beam self-cleaning, by means of a semi-classical statistical mechanics model of wave thermalization. This approach is confirmed by an extensive experimental characterization, based on a holographic mode decomposition technique, employing laser pulses with temporal durations ranging from femtoseconds up to nanoseconds. An excellent agreement between theory and experiments is found, which demonstrates that beam self-cleaning can be fully described in terms of the basic conservation laws of statistical mechanics.
AB - Since its first demonstration in graded-index multimode fibers, spatial beam selfcleaning has attracted a growing research interest. It allows for the propagation of beams with a bell-shaped spatial profile, thus enabling the use of multimode fibers for several applications, from biomedical imaging to high-power beam delivery. So far, beam self-cleaning has been experimentally studied under several different experimental conditions. Whereas it has been theoretically described as the irreversible energy transfer from high-order modes towards the fundamental mode, in analogy with a beam condensation mechanism. Here, we provide a comprehensive theoretical description of beam self-cleaning, by means of a semi-classical statistical mechanics model of wave thermalization. This approach is confirmed by an extensive experimental characterization, based on a holographic mode decomposition technique, employing laser pulses with temporal durations ranging from femtoseconds up to nanoseconds. An excellent agreement between theory and experiments is found, which demonstrates that beam self-cleaning can be fully described in terms of the basic conservation laws of statistical mechanics.
UR - http://www.scopus.com/inward/record.url?scp=85126654564&partnerID=8YFLogxK
U2 - 10.1364/OE.449187
DO - 10.1364/OE.449187
M3 - Article
C2 - 35473042
AN - SCOPUS:85126654564
VL - 30
SP - 10850
EP - 10865
JO - Optics Express
JF - Optics Express
SN - 1094-4087
IS - 7
ER -
ID: 35768583