Wave kinetics of random fibre lasers

Churkin, D.V., Kolokolov, I.V., Podivilov, E.V., Vatnik, I.D., Nikulin, M., Vergeles, S.S., Terekhov, I.S., Lebedev, V.V., Falkovich, Gregory E., Babin, Sergey A. and Turitsyn, S.K. (2015). Wave kinetics of random fibre lasers. Nature Communications, 6 ,

Abstract

Traditional wave kinetics describes the slow evolution of systems with many degrees of freedom to equilibrium via numerous weak non-linear interactions and fails for very important class of dissipative (active) optical systems with cyclic gain and losses, such as lasers with non-linear intracavity dynamics. Here we introduce a conceptually new class of cyclic wave systems, characterized by non-uniform double-scale dynamics with strong periodic changes of the energy spectrum and slow evolution from cycle to cycle to a statistically steady state. Taking a practically important example—random fibre laser—we show that a model describing such a system is close to integrable non-linear Schrödinger equation and needs a new formalism of wave kinetics, developed here. We derive a non-linear kinetic theory of the laser spectrum, generalizing the seminal linear model of Schawlow and Townes. Experimental results agree with our theory. The work has implications for describing kinetics of cyclical systems beyond photonics.

Publication DOI: https://doi.org/10.1038/ncomms7214
Divisions: Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Engineering & Applied Sciences > Aston Institute of Photonics Technology
Additional Information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ Supplementary Information accompanies this paper at http://www.nature.com/naturecommunications
Full Text Link: http://www.natu ... omms7214.html#t
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Published Date: 2015-02-03
Authors: Churkin, D.V.
Kolokolov, I.V.
Podivilov, E.V.
Vatnik, I.D.
Nikulin, M.
Vergeles, S.S.
Terekhov, I.S.
Lebedev, V.V.
Falkovich, Gregory E.
Babin, Sergey A.
Turitsyn, S.K. ( 0000-0003-0101-3834)

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License: Creative Commons Attribution


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