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Vortex laser from anti-resonant ring coupled cavities.

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    Directly generating optical vortex Laguerre-Gaussian (LG) modes is now possible using an anti-resonant ring coupled laser cavity. This new method enables high-power, pure vortex beam production with controlled handedness.

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    Area of Science:

    • Laser physics and optics
    • Photonics and optical engineering

    Background:

    • Optical vortex Laguerre-Gaussian (LG) modes are crucial for various applications due to their unique spatial structure and orbital angular momentum.
    • Direct laser generation of these modes offers pure, high-power beams but has faced limitations in applicability.
    • Existing methods often lack versatility for different gain media or operating regimes (pulsed/continuous wave).

    Purpose of the Study:

    • To propose and demonstrate a novel method for direct generation of Laguerre-Gaussian (LG0l) vortex modes.
    • To achieve high-power, high-purity vortex beams with controlled handedness.
    • To develop a versatile technique applicable to various bulk gain media and laser operation modes.

    Main Methods:

    • Implementation of an anti-resonant ring (ARR) coupled laser cavity geometry.
    • Sharing a single gain medium between two coupled laser cavities within the ARR configuration.
    • Utilizing standard, wavelength-insensitive optical components for mode generation.
    • Demonstration using a diode end-pumped Neodymium-doped Yttrium Orthovanadate (Nd:YVO4) gain medium.

    Main Results:

    • Successful direct generation of LG01 and LG02 vortex modes.
    • Achieved 8.9 W of LG01 and 4.3 W of LG02 modes from 24 W of pump power.
    • Demonstrated high mode purity and pure handedness for the generated vortex beams.
    • Introduced and validated a new technique for controlling the handedness of the LG01 mode.

    Conclusions:

    • The anti-resonant ring coupled laser cavity provides an effective platform for direct LG0l vortex mode generation.
    • The technique is suitable for high peak and average power levels and adaptable to various bulk gain media and laser regimes.
    • This method offers a promising route for producing high-quality optical vortex beams with controlled properties.