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Kaleidoscope vortex lasers generated from astigmatic cavities with longitudinal-transverse coupling.

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    We present a novel method for creating kaleidoscope vortex beams using an astigmatic laser cavity. This technique generates complex optical vortex beams with tunable symmetry and potential for optical entanglement applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Quantum Optics

    Background:

    • Vortex beams, characterized by helical phase fronts, carry orbital angular momentum (OAM).
    • Generating complex vortex beam structures, such as kaleidoscope vortex beams, is crucial for advanced optical applications.
    • Existing methods for vortex beam generation can be complex or limited in tunability.

    Purpose of the Study:

    • To propose and demonstrate an efficient and robust method for generating kaleidoscope vortex beams.
    • To investigate the formation mechanism of kaleidoscope vortex beams arising from mode superposition and longitudinal-transverse coupling.
    • To achieve systematic control over the symmetry of generated kaleidoscope vortex beams.

    Main Methods:

    • Employing an astigmatic laser cavity with an additional external cylindrical lens.
    • Utilizing the superposition of Laguerre-Gaussian modes within the laser cavity.
    • Experimentally demonstrating the generation of kaleidoscope vortex beams with varying symmetry.

    Main Results:

    • Successful generation of kaleidoscope vortex beams with controllable symmetry.
    • Observation of complex phase singularities resulting from mode superposition.
    • Demonstration of the dependence of laser output power on cavity length.

    Conclusions:

    • The proposed method provides an efficient and robust way to generate kaleidoscope vortex beams.
    • The technique allows for systematic control over beam symmetry and offers potential for creating high-order optical vortex beams.
    • This approach may facilitate advancements in optical entanglement and related quantum information processing.