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Optimization of microwave emission from laser filamentation with a machine learning algorithm.

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    Optimizing laser wavefronts enhances microwave radiation yield from atmospheric laser filamentation plasmas. This method, using a genetic algorithm, can double microwave field strength and improve plasma characteristics.

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    Area of Science:

    • Plasma physics
    • Nonlinear optics
    • Laser-matter interactions

    Background:

    • Laser filamentation in atmosphere generates microwave radiation.
    • Controlling laser wavefronts is crucial for optimizing plasma-generated radiation.

    Purpose of the Study:

    • To optimize microwave radiation yield from laser-induced atmospheric plasmas.
    • To investigate the effect of laser wavefront manipulation on plasma properties.

    Main Methods:

    • Utilized a genetic algorithm to control a deformable mirror for laser wavefront reconfiguration.
    • Employed microwave waveform amplitude as feedback for the optimization process.
    • Conducted optimization experiments at varying air pressures.

    Main Results:

    • Achieved a doubling of microwave field strength compared to a flat mirror configuration.
    • Observed increased plasma fluorescence volume and brightness.
    • Demonstrated improved laser beam intensity profile within the filamentation region.

    Conclusions:

    • Laser wavefront optimization is an effective method for enhancing microwave radiation from atmospheric plasmas.
    • The observed improvements in plasma fluorescence correlate with enhanced microwave emission.
    • The study highlights the potential for precise control over laser-plasma interactions for directed energy applications.