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Highly efficient and widely tunable Si3N4 waveguide-based optical parametric oscillator.

Ming Gao, Niklas M Lüpken, Carsten Fallnich

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    |April 4, 2024
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    Summary
    This summary is machine-generated.

    We developed a tunable silicon nitride waveguide optical parametric oscillator (OPO) using four-wave mixing (FWM). This chip-based light source achieves high efficiency and broad tunability for applications like coherent anti-Stokes Raman scattering.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science
    • Nonlinear Optics

    Background:

    • Optical parametric oscillators (OPOs) are crucial for generating tunable light.
    • Silicon nitride (Si3N4) waveguides offer unique nonlinear properties for integrated photonics.
    • Four-wave mixing (FWM) is a key nonlinear process for parametric light generation.

    Purpose of the Study:

    • To demonstrate an efficient and widely tunable synchronously pumped optical parametric oscillator (OPO) in a silicon nitride waveguide.
    • To leverage four-wave mixing (FWM) in Si3N4 for enhanced parametric generation.
    • To develop a compact, chip-based light source with improved performance.

    Main Methods:

    • Utilized a silicon nitride (Si3N4) waveguide with inverted tapers.
    • Employed synchronously pumped optical parametric oscillation (OPO) exploiting four-wave mixing (FWM).
    • Characterized pump-to-idler conversion efficiency, pump depletion, and output idler pulse energy.

    Main Results:

    • Achieved high external pump-to-idler conversion efficiency of -7.64 dB at 74% pump depletion.
    • Generated up to 387 pJ output idler pulse energy around 1.13 μm.
    • Demonstrated a 64 dB amplification of idler power spectral density and 191 nm wavelength tunability around 1.15 μm.

    Conclusions:

    • The waveguide-based OPO (WOPO) shows significant improvements in conversion efficiency and output energy compared to other chi(3) WOPOs.
    • This highly efficient and tunable chip-based light source is promising for applications such as coherent anti-Stokes Raman scattering.
    • Represents a key advancement towards integrated photonic light sources.