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Continuous-wave, singly resonant parametric oscillator-based mid-infrared optical vortex source.

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    We developed a high-power, tunable mid-infrared optical vortex source. This system efficiently transfers orbital angular momentum (OAM) from near-infrared pump lasers to mid-infrared vortex beams using a singly resonant optical parametric oscillator.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Optical vortices, beams with helical phase fronts, have unique properties.
    • Generating tunable mid-infrared (mid-IR) optical vortices is challenging.
    • Singly resonant optical parametric oscillators (SROs) are versatile laser sources.

    Purpose of the Study:

    • To create a high-power, continuous-wave (CW) source of tunable optical vortices in the mid-IR.
    • To investigate the transfer of orbital angular momentum (OAM) from a near-IR pump to a mid-IR idler beam.
    • To characterize the power, tunability, and stability of the generated mid-IR vortex beams.

    Main Methods:

    • Utilized a singly resonant optical parametric oscillator (SRO) configured in a four-mirror ring cavity.
    • Employed a MgO-doped periodically poled lithium niobate (PPLN) crystal for parametric down-conversion.
    • Pumped the SRO with near-IR vortex beams (lp=1, 2) at 1064 nm.
    • Leveraged orbital angular momentum (OAM) conservation and cavity mode threshold conditions.

    Main Results:

    • Generated tunable mid-IR idler vortex beams (2217-3574 nm) with output power exceeding 2 W for li=1.
    • Achieved vortex conversion efficiencies up to 23.8% for pump vortices (lp=1, 2) at 22 W pump power.
    • Demonstrated idler vortex beams with the same OAM order as the pump.
    • Observed a spectral width of 101 MHz and passive power stability of 4.9% over 2 hours.

    Conclusions:

    • Successfully demonstrated a high-power, CW mid-IR optical vortex source.
    • Validated the efficient transfer of OAM from near-IR to mid-IR wavelengths via parametric processes.
    • The developed source shows potential for applications requiring structured mid-IR light.