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EnglishThe wave turbulence theory predicts that a conservative system of nonlinear waves can exhibit a process of condensation, which originates in the singularity of the Rayleigh-Jeans equilibrium distribution of classical waves. Considering light propagation in a multimode fiber, we show that light condensation is driven by an energy flow toward the higher-order modes, and a bi-directional redistribution of the wave-action (or power) to the fundamental mode and to higher-order modes. The analysis of the near-field intensity distribution provides experimental evidence of this mechanism. The kinetic equation also shows that the wave-action and energy flows can be inverted through a thermalization toward a negative temperature equilibrium state, in which the high-order modes are more populated than low-order modes. In addition, a Bogoliubov stability analysis reveals that the condensate state is stable. Copyright (C) 2021 EPLA
Energy and wave-action flows underlying Rayleigh-Jeans thermalization of optical waves propagating in a multimode fiber((a)) / Baudin, K; Fusaro, A; Garnier, J; Berti, N; Krupa, K; Carusotto, I; Rica, S; Millot, G; Picozzi, A. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - 134:1(2021). [10.1209/0295-5075/134/14001]
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| Titolo: | Energy and wave-action flows underlying Rayleigh-Jeans thermalization of optical waves propagating in a multimode fiber((a)) | |
| Autori: | Baudin, K; Fusaro, A; Garnier, J; Berti, N; Krupa, K; Carusotto, I; Rica, S; Millot, G; Picozzi, A | |
| Autori Unitn: | ||
| Titolo del periodico: | EUROPHYSICS LETTERS | |
| Anno di pubblicazione: | 2021 | |
| Numero e parte del fascicolo: | 1 | |
| Codice identificativo WOS: | WOS:000731468600008 | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1209/0295-5075/134/14001 | |
| Handle: | http://hdl.handle.net/11572/343900 | |
| Citazione: | Energy and wave-action flows underlying Rayleigh-Jeans thermalization of optical waves propagating in a multimode fiber((a)) / Baudin, K; Fusaro, A; Garnier, J; Berti, N; Krupa, K; Carusotto, I; Rica, S; Millot, G; Picozzi, A. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - 134:1(2021). [10.1209/0295-5075/134/14001] | |
| Appare nelle tipologie: | 03.1 Articolo su rivista (Journal article) |
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