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Adaptive laser-induced ultrasound generation using a micro-mirror array spatial light modulator.

Felix Schmieder, Lars Büttner, Jürgen Czarske

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    This study introduces holographic laser ultrasonics, enabling arbitrary ultrasound focal patterns without mechanical parts. This method allows for precise material analysis and imaging deep within samples.

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    Area of Science:

    • Physics
    • Materials Science
    • Acoustics

    Background:

    • Laser ultrasonics offers contactless material property investigation (e.g., Young's modulus, layer thickness).
    • Traditional Gaussian laser beams create diverging sound fields with rapidly diminishing intensity.
    • Modifying beam profiles typically involves slow mechanical adjustments or component exchanges.

    Purpose of the Study:

    • To develop a novel laser ultrasonics setup for generating arbitrary ultrasonic intensity distributions.
    • To overcome the limitations of diverging sound fields and slow beam profile adjustments in conventional methods.
    • To enable high-resolution, non-contact material characterization and imaging.

    Main Methods:

    • Utilized holographic projection via a MEMS spatial light modulator to create custom laser intensity profiles.
    • Employed ring-shaped intensity distributions of varying diameters for axial scanning of ultrasound foci.
    • Achieved scanning depths up to 7.4 mm without any mechanical movement of optical elements.

    Main Results:

    • Generated high-intensity ultrasound foci with a narrow width of 1.6 mm.
    • Successfully scanned these foci axially within a sample to depths of 7.4 mm.
    • Demonstrated the ability to create arbitrary intensity distributions and control ultrasound focal patterns.

    Conclusions:

    • The holographic laser ultrasonics technique provides precise control over ultrasound focal patterns.
    • This method facilitates non-contact, in-depth material analysis with high spatial resolution.
    • The technique shows significant promise for applications in flaw detection and biological tissue scanning.