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Related Experiment Videos

Multifilamentation transmission through fog.

G Méjean1, J Kasparian, J Yu

  • 1Teramobile, LASIM, UMR CNRS 5579, Université Claude Bernard Lyon 1, 43 bd du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 4, 2005
PubMed
Summary

Dense fogs reduce the number and energy of filaments from high-power laser beams. This research explores aerosol effects on laser propagation, crucial for atmospheric optics.

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Area of Science:

  • Nonlinear Optics
  • Atmospheric Physics
  • Laser-Matter Interactions

Background:

  • High-power laser beams can form filaments during propagation in air.
  • Atmospheric aerosols, like fog, can significantly alter laser beam characteristics.
  • Understanding these interactions is vital for applications involving laser propagation through the atmosphere.

Purpose of the Study:

  • To investigate the influence of atmospheric aerosols on laser beam filamentation.
  • To experimentally and numerically analyze the effects of fog on terawatt (TW) laser propagation over 10-meter scales.

Main Methods:

  • Experimental investigation of TW laser beam propagation through dense fog.
  • Numerical simulations modeling fog as a linear dissipator and comparing with randomly distributed opaque droplets.

Related Experiment Videos

  • Analysis of beam envelope energy dissipation and filament number reduction.

    • Main Results:

    • Dense fogs cause quasi-linear dissipation of laser beam envelope energy.
    • The number of filaments is diminished proportionally to fog density.
    • Power per filament is estimated at approximately 5 critical powers for self-focusing in air.

    Conclusions:

    • Micrometric fog droplets act as linear dissipators, affecting laser filamentation.
    • Laser beam power content strongly influences the number of filaments formed in aerosolized conditions.
    • Numerical models confirm experimental observations of aerosol-induced damping on laser propagation.