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Simultaneous sum-frequency and second-harmonic generation in a planar waveguide.

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    This study demonstrates simultaneous second-harmonic (SH) and sum-frequency (SF) generation in a planar waveguide. The noncollinear output simplifies light collection and enhances tunability and efficiency compared to bulk methods.

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    Area of Science:

    • Nonlinear optics
    • Quantum optics
    • Materials science

    Background:

    • Second-harmonic (SH) and sum-frequency (SF) generation are fundamental nonlinear optical processes.
    • Planar waveguides offer enhanced light-matter interaction for nonlinear processes.
    • Quasi-phase-matching (QPM) is crucial for efficient nonlinear frequency conversion.

    Purpose of the Study:

    • To analyze SH and SF generation in a 2D QPM planar waveguide.
    • To demonstrate simultaneous SH and SF generation.
    • To investigate the noncollinear emission and tunability of the generated frequencies.

    Main Methods:

    • Utilizing 2D QPM gratings in a planar waveguide configuration.
    • Performing numerical simulations in a potassium titanyl phosphate (KTP) planar waveguide.
    • Analyzing the noncollinear emission angles of SH and SF waves.

    Main Results:

    • Achieved simultaneous SH and SF generation.
    • Demonstrated noncollinear emission of SH and SF waves at distinct angles for efficient collection.
    • Showcased wavelength tunability.
    • Observed greater conversion efficiencies than bulk configurations and larger bandwidth than channel waveguides.

    Conclusions:

    • The proposed 2D QPM planar waveguide configuration enables efficient and tunable simultaneous SH and SF generation.
    • The noncollinear output facilitates simplified optical component integration and light collection.
    • This approach offers advantages over traditional bulk and channel waveguide methods for nonlinear frequency conversion.