| Issue |
EPJ Web Conf.
Volume 287, 2023
EOS Annual Meeting (EOSAM 2023)
|
|
|---|---|---|
| Article Number | 06024 | |
| Number of page(s) | 2 | |
| Section | Topical Meeting (TOM) 6- Nonlinear and Quantum Optics | |
| DOI | https://doi.org/10.1051/epjconf/202328706024 | |
| Published online | 18 October 2023 | |
https://doi.org/10.1051/epjconf/202328706024
Thermalization of light waves in multimode optical fibers: Negative temperatures equilibrium states and the role of disorder - INVITED
1 Université de Bourgogne, Laboratoire Interdisciplinaire Carnot de Bourgogne, Dijon, France
2 CMAP, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau Cedex, France
3 CEA, DAM, DIF, F-91297 Arpajon Cedex, France
4 Université Côte d’Azur, CNRS, Institut de Physique de Nice, Nice, France
5 Institute of Physical Chemistry Polish Academy of Sciences, Warsaw, Poland
* Corresponding author: Antonio.Picozzi@u-bourgogne.fr
Published online: 18 October 2023
Nonlinear random waves exhibit a phenomenon of irreversible thermalization, in analogy with the thermalization of a classical gas system. This irreversible process of thermalization to the Rayleigh-Jeans equilibrium distribution has been recently observed experimentally in multimode optical fibers. Here we discuss a recent progress along two different directions. Firstly, we report the observation of thermalization to negative temperature equilibrium states, in which high-order fiber modes are more populated than low-order modes. Secondly, we analyze the impact of disorder inherent to light propagation in multimode fibers. We identify an unexpected regime in which strong random coupling among non-degenerate modes leads to a nonequilibrium process of Rayleigh-Jeans thermalization.
© The Authors, published by EDP Sciences, 2023
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