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Engineering temporal-mode-selective frequency conversion in nonlinear optical waveguides: from theory to experiment.

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    Quantum frequency conversion (FC) achieves high temporal-mode selectivity using nonlinear optical media. Experimental verification confirms theoretical predictions, paving the way for near-perfect selectivity in future applications.

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    Area of Science:

    • Quantum optics
    • Nonlinear optics
    • Photonics

    Background:

    • Quantum frequency conversion (FC) is crucial for manipulating light's temporal modes.
    • Achieving high mode selectivity often requires complex optimization schemes.
    • Previous research identified specific parameter regimes for good selectivity.

    Purpose of the Study:

    • To experimentally verify theoretical predictions of Schmidt modes for high temporal-mode selectivity in FC.
    • To validate the effectiveness of specific parameter combinations (group velocities, medium length, pulse width) in achieving high selectivity.
    • To lay the groundwork for implementing a two-stage FC scheme with predicted near-perfect selectivity.

    Main Methods:

    • Utilized a second-harmonic generation MgO:PPLN waveguide.
    • Employed ultrashort pulses (approx. 500 fs) at ~800 nm wavelengths.
    • Experimentally validated model-predicted Schmidt modes under specific operating conditions.

    Main Results:

    • Experimental results demonstrated high temporal-mode selectivity, aligning with theoretical predictions.
    • Achieved selectivities exceeding 80% for temporal modes similar to pump pulse shapes.
    • Confirmed the efficacy of the chosen parameter regime for efficient FC.

    Conclusions:

    • The study experimentally validates the theoretical framework for high-selectivity quantum frequency conversion.
    • The findings support the use of Schmidt modes for precise temporal-mode control in nonlinear optical systems.
    • This work enables the development of advanced FC schemes targeting near-perfect mode selectivity.