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Simultaneous spatial and temporal focusing optical vortex pulses for micromachining through optically transparent

Yuanxin Tan, Longfei Ji, Zhaoxiang Liu

    Optics Express
    |December 16, 2022
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    We used optical vortex beams with simultaneous spatial and temporal focusing (SSTF) to precisely control laser ablation. This method created high-quality microchannels in glass, avoiding unwanted self-focusing effects.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Laser Physics

    Background:

    • Conventional focusing schemes can suffer from nonlinear self-focusing.
    • Precise control over laser-material interaction is crucial for microfabrication.

    Purpose of the Study:

    • To introduce optical vortex beams into the simultaneous spatial and temporal focusing (SSTF) technique.
    • To demonstrate local control of peak intensity distribution in SSTF optical vortex (SSTF OV) beams.
    • To achieve controlled microchannel fabrication in glass substrates.

    Main Methods:

    • Theoretical and experimental investigation of SSTF OV beams.
    • Employing spatiotemporally focused femtosecond laser vortex beams.
    • Fabricating microchannels on soda-lime glass and fused silica.

    Main Results:

    • Demonstrated local control of peak intensity distribution at the focus of SSTF OV beams.
    • Achieved doughnut-shaped ablation patterns.
    • Created high aspect ratio (∼28) microchannels.
    • Successfully processed 3 mm thick glass substrates.

    Conclusions:

    • The SSTF OV technique offers precise control over laser focal intensity.
    • This method enables efficient and controlled microfabrication of glass materials.
    • The approach avoids nonlinear self-focusing issues inherent in conventional methods.