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    Area of Science:

    • Acoustic manipulation
    • Optics
    • Fluid dynamics

    Background:

    • Acoustic vortices offer unique properties for wave manipulation.
    • Controlling light beams in liquid media presents challenges.
    • Focused ultrasound can generate stable structures in fluids.

    Purpose of the Study:

    • To investigate the use of acoustic vortices for laser beam focusing and steering.
    • To analyze the impact of acoustic pressure and dissolved oxygen on vortex formation and laser manipulation.
    • To demonstrate a real-time, non-mechanical method for light control in liquids.

    Main Methods:

    • Generation of an acoustic vortex using a high-intensity focused ultrasound transducer.
    • Formation of a bubble wall lens by the acoustic vortex.
    • Focusing and steering a laser beam through the acoustic lens.
    • Testing effects of varying acoustic pressures and dissolved oxygen levels.

    Main Results:

    • The acoustic vortex effectively focused a laser beam, increasing peak intensity by 55.6%.
    • The laser beam's width at half maximum was reduced from 1.16 mm to 0.91 mm.
    • Dynamic steering of the laser beam was achieved over a 0° to 0.7° range without mechanical components.

    Conclusions:

    • Acoustic vortex lensing provides a stable, real-time method for laser beam manipulation in liquids.
    • The technique demonstrates precise control and potential for applications in heterogeneous media.
    • Future work should address hardware limitations and explore parameter optimization for enhanced performance.