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Related Experiment Videos

Femtosecond self-guided atmospheric light strings.

J. V. Moloney1, M. Kolesik, M. Mlejnek

  • 1Arizona Center for Mathematical Sciences, Department of Mathematics, University of Arizona, Tucson, Arizona 85721.

Chaos (Woodbury, N.Y.)
|June 5, 2003
PubMed
Summary

High power laser pulses in air form filamentary structures, mimicking strong turbulence. These structures are sustained by nonlinear dynamics, not dissipation, with plasma generation playing a key role.

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Area of Science:

  • Nonlinear optics
  • Plasma physics
  • Fluid dynamics

Background:

  • High power femtosecond laser pulses exhibit complex filamentary structures during long-distance propagation in air.
  • These phenomena share similarities with strong turbulence events observed in various physics domains.
  • Traditional dissipation mechanisms are not the primary regulators of the underlying singular dynamical events.

Purpose of the Study:

  • To identify the robust nonlinear mode responsible for initiating and sustaining filamentary waveguides.
  • To elucidate the physical mechanisms that regularize the collapse singularity.
  • To understand the dynamic nature of the nonlinear waveguide formed by laser propagation.

Main Methods:

  • Analysis of the two-dimensional (2D) nonlinear Schrodinger equation to identify the collapse singularity.

Related Experiment Videos

  • Investigation of physical collapse regularization mechanisms, including normal group velocity dispersion.
  • Examination of plasma generation in high-intensity nonlinear focal regions and its effects.

    • Main Results:

    • The collapse singularity of the 2D nonlinear Schrodinger equation is identified as the key nonlinear mode.
    • Normal group velocity dispersion and plasma generation act as physical regularization mechanisms.
    • Plasma absorption is minimal; transient generation of a defocusing lens is the dominant process, evacuating light behind the filament.

    Conclusions:

    • The nonlinear waveguide is highly dynamic, driven by transient plasma effects rather than simple dissipation.
    • The identified nonlinear mode provides a robust mechanism for waveguide initiation and sustenance.
    • Understanding these dynamics is crucial for applications involving high power laser propagation.