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Third-harmonic generation in CMOS-compatible highly doped silica micro-ring resonator.

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    Researchers demonstrate visible light emission using highly doped silica glass micro-ring resonators (MRRs) via third-harmonic generation (THG). This nonlinear optical process achieved green light conversion efficiency in a high-Q resonator.

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    Area of Science:

    • Nonlinear optics
    • Materials science
    • Photonics

    Background:

    • Micro-ring resonators (MRRs) are key photonic devices.
    • Third-harmonic generation (THG) is a nonlinear optical process for frequency conversion.
    • Silica glass is a versatile material for optical applications.

    Purpose of the Study:

    • To demonstrate visible emission from highly doped silica glass MRRs.
    • To investigate the third-harmonic generation (THG) nonlinear process in these resonators.
    • To develop a thermal nonlinear model for in-cavity power effects.

    Main Methods:

    • Fabrication of highly doped silica glass micro-ring resonators (MRRs).
    • Pumping MRRs in the telecom band to observe nonlinear optical effects.
    • Development and application of a thermal nonlinear model to analyze resonance detuning.
    • Calibration of TH resonance shift by accounting for thermal nonlinear-induced phase mismatch.

    Main Results:

    • First demonstration of visible emission from highly doped silica glass MRRs via THG.
    • Achieved a green light conversion efficiency of 2.7×10^-5 W^-2.
    • Observed a loaded Q-factor of 1.4×10^6 in the MRR.
    • Validated the theoretical threefold wavelength relationship and measured cubic power relationship.

    Conclusions:

    • Highly doped silica glass MRRs are effective for visible light generation through THG.
    • Thermal nonlinear effects play a significant role in the in-cavity power dynamics.
    • The developed thermal nonlinear model accurately explains resonance detuning and phase mismatch.