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Optical Kerr effect field measurements and ad hoc engineering model comparisons.

Larry B Stotts, Antonio Oliver, Gregory DiComo

    Optics Express
    |October 7, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new model to predict laser filamentation in real atmospheres. The model uses beam properties and atmospheric conditions to estimate light channel formation, validated by simulations and experiments.

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    Area of Science:

    • Nonlinear Optics
    • Atmospheric Optics
    • Laser Physics

    Background:

    • Optical Kerr effects from high peak-power laser beams in atmospheres are well-studied.
    • Predicting filamentation onset and light channel formation remains a challenge.

    Purpose of the Study:

    • To propose a novel analytical model for predicting filamentation/light channel onset distance in real atmospheres.
    • To quantify the radius of light channels formed by self-focusing, with and without plasma filamentation.

    Main Methods:

    • Developed an analytical model based on modulation instability.
    • Utilized a weighted ratio of Gaussian beam diameter to lateral coherence radius.
    • Incorporated atmospheric absorption and turbulence into the model.

    Main Results:

    • The model predicts normalized intensity growth as an exponential function of propagation distance.
    • Onset distance predictions are compared with computer simulations and field experiments.
    • Theoretical radius calculations are compared to measurements from 1.5-micron USPL field experiments.

    Conclusions:

    • The proposed model offers a new analytical approach to understanding laser beam propagation and filamentation in real atmospheres.
    • The model provides a method to estimate beam collapse distance and light channel radius.
    • Experimental validation supports the model's predictive capabilities for atmospheric laser propagation.