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    Researchers demonstrate efficient parametric upconversion of Ince-Gaussian (IG) modes, a type of structured light. They found flattop-beam pumps preserve IG mode integrity, unlike Gaussian pumps which cause distortion.

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    Area of Science:

    • Optics and Photonics
    • Quantum Information Science

    Background:

    • Ince-Gaussian (IG) modes are structured light beams that are eigenfunctions of the paraxial wave equation in elliptical coordinates.
    • These propagation-invariant modes have potential applications but their nonlinear transformations are understudied.

    Purpose of the Study:

    • To report the first demonstration of parametric upconversion of IG modes.
    • To identify the selection rules for IG mode upconversion.
    • To investigate the nonlinear transformation of IG modes under different pump conditions.

    Main Methods:

    • Parametric upconversion experiments using IG modes.
    • Utilized both flattop-beam and Gaussian beam pumps.
    • Analyzed mode distortion and spectral properties of the upconverted signals.

    Main Results:

    • Achieved perfect parametric upconversion of IG modes using a flattop-beam pump.
    • Observed significant mode distortion when using a Gaussian pump due to radial-mode degeneration.
    • Identified the full-field selection rule for IG mode upconversion.

    Conclusions:

    • Parametric upconversion of IG modes is feasible and highly dependent on pump beam profile.
    • Flattop-beam pumps are crucial for preserving IG mode structure during upconversion.
    • This work paves the way for applications in quantum frequency interfacing and upconversion imaging.