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    This study introduces a powerful monolithic optical parametric oscillator (OPO) generating W-level single-frequency mid-infrared (MIR) light and optical vortex beams for advanced laser applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Optical parametric oscillators (OPOs) are crucial for generating tunable laser light.
    • Achieving high-power, single-frequency, and vortex beam generation simultaneously presents significant challenges.

    Purpose of the Study:

    • To develop a pump-enhanced monolithic OPO for W-level single-frequency mid-infrared (MIR) output.
    • To demonstrate optical vortex beam generation and orbital angular momentum transfer using the OPO.

    Main Methods:

    • A monolithic OPO design utilizing a Gaussian pump and a pump-enhanced cavity.
    • Characterization of output power, tuning range, linewidth, and power stability.
    • Pumping the OPO with an optical vortex to study angular momentum transfer.

    Main Results:

    • Achieved maximum idler output power of 1.4 W with a tuning range of 3016-3200 nm.
    • Maintained single-frequency operation with a 218 kHz linewidth at W-level output.
    • Demonstrated efficient orbital angular momentum transfer, generating vortex beams up to 1.8 W.

    Conclusions:

    • The developed pump-enhanced monolithic OPO offers high-power, single-frequency MIR output.
    • The OPO successfully generates optical vortex beams, enabling applications in angular momentum transfer.
    • This work advances the capabilities of MIR laser sources for diverse scientific and technological applications.