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Cavity-enhanced polarization-independent frequency conversion for vector beams.

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    This summary is machine-generated.

    We developed a highly efficient, polarization-independent method for nonlinear frequency conversion of vector beams. This technique enhances optical communications and structured light applications.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Quantum Information Science

    Background:

    • Vector beams, crucial for advanced optical applications, face challenges in nonlinear frequency conversion due to sensitivity and low efficiency.
    • Existing methods struggle to efficiently convert the frequency of vector beams while preserving their complex polarization structures.

    Purpose of the Study:

    • To demonstrate a highly efficient, polarization-independent nonlinear frequency conversion technique for vector beams.
    • To overcome the limitations of current methods in terms of sensitivity and conversion efficiency.

    Main Methods:

    • Employed an external-cavity-enhanced difference-frequency generation (DFG) setup within a Sagnac configuration.
    • Utilized vector beams represented on the higher-order Poincaré sphere for frequency conversion experiments.

    Main Results:

    • Achieved high external quantum efficiencies of 43.85% for l=1 and 16.83% for l=2 vector beams.
    • Demonstrated efficient continuous-wave (CW) frequency conversion with polarization-independent operation.
    • Verified the preservation of the vectorial polarization structure in the frequency-converted beams using spatial Stokes measurements.

    Conclusions:

    • The developed cavity-enhanced DFG method offers an efficient approach for wavelength manipulation of vector beams.
    • This technique is promising for applications in structured-light control, optical communications, and nonlinear photonic interfaces.