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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Fully-resonant, tunable, monolithic frequency conversion as a coherent UVA source.

Joanna A Zielińska, Andrius Zukauskas, Carlota Canalias

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    Summary
    This summary is machine-generated.

    We developed a tunable monolithic frequency converter using Rb-doped KTP for efficient second harmonic generation. Optical bistability enhances output stability against pump variations.

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    Area of Science:

    • Nonlinear optics
    • Solid-state laser technology
    • Materials science

    Background:

    • Efficient frequency conversion is crucial for laser applications.
    • Periodically poled materials offer tailored nonlinear optical properties.
    • Tuning and phase-matching are critical for optimal performance.

    Purpose of the Study:

    • To demonstrate a monolithic frequency converter with multiple tuning degrees of freedom.
    • To achieve efficient continuous-wave second harmonic generation (SHG).
    • To investigate the impact of optical bistability on output stability.

    Main Methods:

    • Fabrication of a monolithic Rb-doped periodically-poled potassium titanyl phosphate (KTP) device.
    • Incorporation of three temperature and one strain tuning elements.
    • Characterization of second harmonic generation efficiency and optical bistability.

    Main Results:

    • Demonstrated efficient continuous-wave SHG from 795 nm to 397 nm.
    • Achieved a low-power efficiency of 72% and a high-power slope efficiency of 4.5%.
    • Observed optical bistability, showing potential for improved output stability.

    Conclusions:

    • The monolithic frequency converter offers precise control over wavelength resonance and phase-matching.
    • The device exhibits high conversion efficiencies.
    • Optical bistability provides a mechanism to enhance output stability against pump fluctuations.