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Fast time-evolving random polarization beam smoothing for laser-driven inertial confinement fusion.

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    We developed a random polarization smoothing method for low-coherence lasers. This technique rapidly randomizes the focal spot polarization, reducing instability in laser-plasma interactions.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Plasma Physics

    Background:

    • Low-coherence lasers are crucial for various applications, but their polarization properties can lead to instabilities, particularly in laser-plasma interactions.
    • Controlling and randomizing the polarization of laser focal spots is essential for mitigating these instabilities.

    Purpose of the Study:

    • To propose and experimentally validate a novel random polarization smoothing method for low-coherence lasers.
    • To investigate the temporal and spatial evolution of polarization in the focal spot.
    • To assess the potential of this technique for reducing laser-induced plasma instabilities.

    Main Methods:

    • Theoretical modeling of polarization evolution using a half-aperture wave plate.
    • Experimental implementation of random polarization smoothing with a thick half-aperture wave plate.
    • Measurement of focal spot polarization using a single-shot polarimeter.

    Main Results:

    • Theoretical calculations confirmed rapid and random polarization evolution in the focal spot.
    • Experimental measurements demonstrated a significant reduction in the degree of polarization to an average of 0.22.
    • The results validate the effectiveness of the proposed random polarization smoothing technique.

    Conclusions:

    • The random polarization smoothing method effectively randomizes the polarization of low-coherence laser focal spots.
    • This technique shows promise for reducing laser-plasma instabilities due to its multi-dimensional random evolution properties.
    • Further research can explore applications in inertial confinement fusion and other laser-driven processes.