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Ultrafine-spaced InGaN-based DFB laser arrays enabled by continuous phase modulation.

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    Summary
    This summary is machine-generated.

    We developed a 420-nm distributed feedback laser diode array for compact quantum sensing. This array offers precise wavelength control and enhanced robustness, paving the way for miniaturized atomic and quantum photonic systems.

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    Area of Science:

    • Photonics and Quantum Technologies
    • Semiconductor Lasers
    • Atomic Physics

    Background:

    • Blue-violet lasers are crucial for compact quantum sensing and metrology.
    • Current sources are bulky or require complex nonlinear frequency conversion.
    • Monolithic InGaN-based distributed feedback laser diodes (DFBs) offer miniaturization but lack precise wavelength control for atomic transitions.

    Purpose of the Study:

    • To demonstrate a 420-nm DFB laser array with ultrafine channel spacing for precise wavelength targeting.
    • To enhance the robustness of DFB laser diodes against fabrication variations.
    • To enable chip-scale atomic and quantum photonic systems with robust blue-violet light sources.

    Main Methods:

    • Fabrication of a 420-nm DFB laser array using a continuously phase-shifted grating design.
    • Integration of ten DFB laser devices to span a 2-nm spectral range.
    • Individual device addressing for coarse wavelength selection and minimized tuning range.

    Main Results:

    • Achieved ultrafine 0.2-nm channel spacing with precise wavelength control.
    • Demonstrated DFB laser diodes with 40 mA threshold current and 1 W/A slope efficiency.
    • Obtained up to 40 mW single-mode output power with a Lorentzian linewidth of 9.8 MHz.

    Conclusions:

    • The continuously phase-shifted grating design enables precise wavelength control and enhances robustness.
    • The DFB laser array provides a practical and manufacturable path toward robust blue-violet light sources.
    • This technology supports the development of next-generation chip-scale atomic and quantum photonic systems.