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Related Experiment Video

Updated: Jun 24, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Noninvasive characterization methods for ultra-short laser pulse induced volume modifications.

Max Steudel, Max-Jonathan Kleefoot, Sebastian Funken

    Optics Express
    |June 11, 2024
    PubMed
    Summary

    Two noninvasive methods, immersion microscopy and scanning acoustic microscopy (SAM), effectively characterize laser-induced modifications in fused silica. These techniques offer faster, repeatable analysis compared to traditional methods.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Non-destructive Testing

    Background:

    • Laser-induced modifications in fused silica are crucial for optical applications.
    • Conventional characterization methods like polishing and etching are time-consuming and destructive.
    • Need for efficient, non-invasive techniques to analyze subsurface material changes.

    Purpose of the Study:

    • To introduce and evaluate two non-invasive characterization methods for laser-induced modifications in bulk fused silica.
    • To compare the capabilities of immersion microscopy and scanning acoustic microscopy (SAM).
    • To demonstrate the advantages of these methods over conventional techniques.

    Main Methods:

    • Characterization using immersion microscopy to visualize internal modifications.

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    Last Updated: Jun 24, 2025

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  • Utilizing scanning acoustic microscopy (SAM) to measure the depth of modifications from the surface.
  • Introduction of Type II modifications using high-repetition-rate laser pulses in fused silica.

    • Main Results:

    • SAM accurately measures the distance from the sample surface to the initial density change.
    • Immersion microscopy provides insights into the internal structure of the modifications.
    • Both methods allow multiple analyses on a single sample, reducing time and material waste.

    Conclusions:

    • Immersion microscopy and SAM are effective non-invasive techniques for characterizing laser-induced modifications in fused silica.
    • These methods offer significant advantages in terms of speed, reusability, and reduced sample preparation compared to destructive methods.
    • The findings support the use of these techniques for quality control and research in laser material processing.