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High-power, 420-nm, low-intensity-noise laser source for quantum computing applications.

Thomas Dubé, Coline Lavit, Dia Darwich

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    Summary
    This summary is machine-generated.

    Researchers generated high-power, single-frequency visible light using fiber lasers and nonlinear crystals. This method achieved efficient conversion, producing 15.2 W of blue light with low noise for advanced applications.

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    Area of Science:

    • Optics and Photonics
    • Nonlinear Optics
    • Laser Physics

    Background:

    • High-power visible light sources are crucial for various scientific applications.
    • Efficient frequency conversion techniques are needed to generate visible light from readily available infrared lasers.

    Purpose of the Study:

    • To demonstrate efficient generation of high-power, single-frequency visible light.
    • To characterize the noise properties and beam quality of the generated light.

    Main Methods:

    • Sum-frequency mixing (SFM) of two high-power infrared fiber laser systems.
    • Utilizing an MgO-doped periodically poled lithium niobate (ppLN) crystal for SFM.
    • Cavity-enhanced second-harmonic generation (SHG) for frequency doubling.

    Main Results:

    • Generated 20.2 W of continuous-wave (CW) single-frequency light at 840 nm via SFM with 48% efficiency.
    • Achieved 15.2 W of CW light at 420 nm via cavity-enhanced SHG with 79% efficiency.
    • Obtained good beam quality (M² < 1.3) and low intensity noise (<0.05% RMS).

    Conclusions:

    • The demonstrated method provides a scalable and efficient route to high-power visible light generation.
    • The generated light exhibits excellent noise characteristics suitable for demanding applications.
    • This work advances the capabilities of nonlinear frequency conversion for laser systems.