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Full-aperture random polarization smoothing for a low-coherence laser facility.

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    Two novel methods for random polarization smoothing in low-coherence lasers were developed. These techniques effectively reduce polarization, generating unpolarized light to suppress laser plasma instabilities.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Laser focal field polarization control is crucial for applications like inertial confinement fusion.
    • Existing methods for polarization smoothing often face limitations such as near-field discontinuity or restricted applicability.

    Purpose of the Study:

    • To propose and validate new full-aperture random polarization smoothing techniques for low-coherence lasers.
    • To achieve fast random polarization evolution in the laser focal field.
    • To generate focal fields approximating unpolarized thermal light for suppressing laser plasma instabilities.

    Main Methods:

    • Development of two methods: one using a birefringent wedge and another using a flat birefringent plate.
    • Designing crystal axis direction and wedge angle to control time delay and spatial displacement.
    • Utilizing the low spatiotemporal coherence of the laser focal field for rapid polarization evolution.

    Main Results:

    • Both methods successfully introduce transient polarization evolution, avoiding near-field discontinuity and operating under high fluence.
    • The birefringent wedge method slightly improved focal spot uniformity.
    • The flat birefringent plate method achieved non-polarization with a degree of polarization (DOP) below 2%.
    • Experimental validation of the birefringent wedge method reduced focal spot DOP from 1 to 0.27.

    Conclusions:

    • The proposed full-aperture random polarization smoothing methods are effective in generating rapidly evolving, randomized focal polarization.
    • These techniques can produce focal fields closely resembling unpolarized thermal light.
    • The developed methods hold promise for suppressing laser plasma instabilities in high-power laser systems.