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    We developed a tunable 1-μm optical vortex laser using a novel optical parametric oscillator. This system efficiently transfers topological charge, producing versatile vortex laser outputs.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Optical vortex lasers are crucial for applications in microscopy, optical manipulation, and quantum information.
    • Generating tunable optical vortex lasers with high energy and specific topological charges remains a challenge.

    Purpose of the Study:

    • To demonstrate a widely tunable 1-μm optical vortex laser.
    • To achieve selective transfer of topological charge from pump to output beams.
    • To investigate the performance of a singly-resonant optical parametric oscillator (OPO) for vortex beam generation.

    Main Methods:

    • Utilized a 0.532-μm optical vortex as the pump source for an optical parametric oscillator.
    • Employed a singly-resonant cavity configuration with cascaded non-critical phase-matching Lithium Triborate (LiB₃O₅) crystals.
    • Investigated the wavelength tunability and topological charge transfer characteristics.

    Main Results:

    • Successfully generated a tunable 1-μm optical vortex laser.
    • Demonstrated selective transfer of topological charge to either the signal or idler output.
    • Achieved vortex output in the wavelength ranges of 850-990 nm and 1130-1300 nm.
    • Obtained a maximum signal vortex output energy of 0.9 mJ with a 10% optical efficiency.

    Conclusions:

    • The developed OPO system provides a versatile platform for generating tunable optical vortex lasers.
    • The cascaded LiB₃O₅ crystal configuration enables efficient topological charge transfer and wavelength control.
    • This work advances the development of advanced laser sources for various scientific and technological applications.