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Fast focus-shifter based on a unimorph deformable mirror.

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    This summary is machine-generated.

    A new piezo-based mirror enables fast, 2 kHz laser focus shifting for 3D remote laser processing. This innovation overcomes limitations of conventional optics, enhancing fabrication techniques.

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    Area of Science:

    • Materials Science and Engineering
    • Optical Engineering
    • Manufacturing Technology

    Background:

    • Remote laser processing is crucial for modern fabrication, requiring precise 3D control of the laser beam's focus.
    • Current methods struggle with rapid longitudinal focus adjustments (z-shifting), limited by conventional optics to a few hundred Hz.

    Purpose of the Study:

    • To develop and demonstrate a novel, high-speed z-shifting mirror for laser processing.
    • To overcome the bandwidth limitations of existing focus control technologies.

    Main Methods:

    • Development and manufacturing of a piezo-based z-shifting mirror.
    • Characterization of the mirror's surface fidelity and actuation speed.
    • Integration into a laser processing system for performance evaluation.

    Main Results:

    • The developed mirror achieves diffraction-limited surface fidelity.
    • It provides a longitudinal focus shift (Δz) exceeding 60 mm.
    • The mirror demonstrates a high actuation rate of 2 kHz, significantly faster than conventional methods.

    Conclusions:

    • The fast piezo-based z-shifting mirror effectively enables high-speed, 3D remote laser processing.
    • This technology advances fabrication capabilities by providing rapid and precise control over laser focus in the longitudinal direction.