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Tunable ultraviolet vortex source based on a continuous-wave optical parametric oscillator.

Varun Sharma, G K Samanta, S Chaitanya Kumar

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    |October 1, 2019
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    This summary is machine-generated.

    We developed a continuous-wave optical parametric oscillator (OPO) that generates tunable ultraviolet optical vortices. This OPO system achieves tunable UV vortex generation and provides high-power idler vortex output.

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    Area of Science:

    • Nonlinear Optics
    • Quantum Optics
    • Laser Physics

    Background:

    • Optical vortices, beams with helical phase fronts, are crucial for applications in microscopy, optical manipulation, and quantum information.
    • Generating tunable optical vortices in the ultraviolet (UV) spectrum remains a significant challenge due to material limitations and process complexities.

    Purpose of the Study:

    • To demonstrate a novel continuous-wave (cw) optical parametric oscillator (OPO) capable of generating tunable optical vortices in the UV.
    • To investigate the generation of UV optical vortices with specific topological charges (l=1, 2) and their tunability.

    Main Methods:

    • Utilized a singly resonant OPO based on a MgO:sPPLT nonlinear crystal, pumped by a cw vortex beam in the green.
    • Employed intracavity sum-frequency generation (SFG) between the undepleted pump and the Gaussian resonant signal in a BiB3O6 crystal.
    • Leveraged conservation of orbital angular momentum for vortex generation in both UV and idler beams.

    Main Results:

    • Successfully generated optical vortices of order l=1 and 2 tunable across 332-344 nm in the UV, with a maximum power of 12 mW.
    • Produced a non-resonant idler vortex beam (l=1, 2) tunable across 1172-1338 nm with a maximum output power of 1.3 W.
    • The signal beam maintained a Gaussian spatial profile.

    Conclusions:

    • The developed OPO system offers a versatile platform for generating tunable UV optical vortices.
    • The high-power idler vortex output provides a valuable resource for applications requiring vortex beams in the near-infrared.
    • This work advances the capability for creating structured light in the challenging UV spectral region.