Spatial beam self-cleaning: from non-equilibrium to thermalization of nonlinear multimode fiber modes
We present a direct experimental demonstration that spatial beam self-cleaning in nonlinear multimode graded-index optical fibers arises from the nonequilibrium evolution of the mode population toward a state of thermal equilibrium. This process is shown to be a result of the maximization of the optical entropy of the modal distribution. Entropy maximization is observed both when the input beam power is increased with a fixed length of fiber, and when the fiber length grows larger while keeping the input beam power constant.
Authors
- Fabio Mangini (ORCID: https://orcid.org/0000-0001-5474-8952)
- Mario Ferraro (ORCID: https://orcid.org/0000-0002-6014-2890)
- Wasyhun A. Gemechu (ORCID: https://orcid.org/0000-0002-6841-9428)
- Denis S. Kharenko (ORCID: https://orcid.org/0000-0002-5670-5961)
- Stefan Wabnitz
- Sergey A. Babin (ORCID: https://orcid.org/0000-0003-3559-6839)
- Mikhail Gervaziev (ORCID: https://orcid.org/0000-0003-1607-4621)
- Vincent Couderc (ORCID: https://orcid.org/0000-0001-8869-741X)
- Yifan Sun (ORCID: https://orcid.org/0000-0003-0676-8259)
Publication Details
- Published
- 2025-03-19
- DOI
- https://doi.org/10.1117/12.3048505
- Primary Topic
- Advanced Fiber Laser Technologies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Agence Nationale de la Recherche
- Russian Science Foundation