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Estimation of laser-induced damage depth from surface image features.

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    This study introduces a new method to measure laser-induced damage depth in fused silica, accounting for bulk growth. The technique uses scattered light intensity to accurately estimate damage volume, improving laser optics diagnostics.

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    Area of Science:

    • Materials Science
    • Optics
    • Laser Physics

    Background:

    • Current laser damage assessment in fused silica relies on surface imaging, neglecting bulk morphology.
    • Damage depth is often assumed proportional to surface diameter, which is inaccurate for bulk-growing sites.

    Purpose of the Study:

    • To propose an accurate estimator for laser damage depth in fused silica optics.
    • To address limitations of surface-based measurements for bulk damage growth.

    Main Methods:

    • Utilizing scattered light intensity as a proxy for damage volume.
    • Developing a novel depth estimator based on pixel intensity analysis.
    • Monitoring damage depth changes during successive laser irradiations.

    Main Results:

    • The proposed estimator accurately tracks damage depth, even during phases of uncorrelated surface and bulk growth.
    • Scattered light intensity is shown to be proportional to damage volume.
    • The method provides a more comprehensive understanding of laser-induced damage progression.

    Conclusions:

    • A new, accurate method for estimating laser damage depth in fused silica is presented.
    • This technique improves the characterization of laser damage in optical materials.
    • The findings are crucial for advancing laser optics performance and durability.