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Decoherence and Turbulence Sources in a Long Laser.

Amy Roche1, Svetlana Slepneva1, Anton Kovalev2

  • 1Department of Physical Sciences, Munster Technological University, Cork, Ireland.

Physical Review Letters
|August 18, 2023
PubMed
Summary
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In long delay lasers, photon statistics evolve from thermal to Poissonian, creating power dropouts. Persistent dropouts form coherent structures, leading to turbulent dynamics and decoherence.

Area of Science:

  • Nonlinear optics
  • Laser physics
  • Complex systems

Background:

  • Understanding laser dynamics is crucial for developing advanced optical technologies.
  • The turn-on process in lasers with long delay times presents unique theoretical challenges.
  • Photon statistics provide insights into the quantum and classical behavior of light emission.

Purpose of the Study:

  • To investigate the laser turn-on dynamics in the long delay limit.
  • To analyze the evolution of photon statistics and identify emergent phenomena.
  • To characterize the nature and impact of coherent structures on laser behavior.

Main Methods:

  • Theoretical modeling using delay differential equations.
  • Numerical simulations of laser cavity dynamics.

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  • Analysis of photon statistics and coherence time evolution.

    • Main Results:

    • Observed universal evolution of photon statistics from thermal to Poissonian.
    • Identified power dropouts, with some persisting to form coherent structures (dark solitons/Nozaki-Bekki holes).
    • Demonstrated that coherent structure collisions induce turbulent dynamics and decoherence.

    Conclusions:

    • Coherent structures play a key role in long-delay laser dynamics, bridging distinct emission domains.
    • Laser coherence time is significantly affected by collisions between these structures.
    • The complex Ginzburg-Landau equation and delay differential equations effectively model this complex behavior.