WIAS Preprint No. 2988, (2022)

Decoherence and turbulence sources in a long laser


  • Roche, Amy
  • Slepneva, Svetlana
  • Kovalev, Anton
  • Pimenov, Alexander
  • Vladimirov, Andrei G.
    ORCID: 0000-0002-7540-8380
  • Marconi, Mathias
  • Giudici, Massimo
  • Huyet, Guillaume

2020 Mathematics Subject Classification

  • 78A60 37N20 78M35


  • SOA-fiber laser, optical turbulence, localized structures, laser turn-on, delay differential equation, model, cavity solitons




We investigate the turn-on process in a laser cavity where the roundtrip time is several orders of magnitude greater than the active medium timescales. In this long delay limit the electromagnetic field build-up can be mapped experimentally roundtrip after roundtrip. We show how coherence settles down starting from a stochastic initial condition. In the early stages of the turn-on, we show that power drop-outs emerge, persist for several round-trips and seed dark solitons. These latter structures exhibit a chaotic dynamics and emit radiation that can lead to an overall turbulent dynamics depending on the cavity dispersion.

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