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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Laser Physics and Technology

    Background:

    • Cooling and trapping neutral atoms requires highly stable laser sources.
    • Previous VECSEL systems have not met the stringent linewidth requirements for narrow atomic transitions.

    Purpose of the Study:

    • To report and characterize sub-kHz linewidth operation of an AlGaInP-based VECSEL.
    • To demonstrate the suitability of this VECSEL for cooling neutral strontium atoms at 689 nm.

    Main Methods:

    • Frequency stabilization using a Pound-Drever-Hall (PDH) technique with a Fabry-Perot cavity.
    • Optical field reconstruction via autocorrelation and the Wiener-Khintchine theorem.
    • Optical beat note measurements against commercial and identical VECSEL systems.

    Main Results:

    • Achieved sub-kHz linewidth operation with >150 mW output power.
    • Estimated linewidth of (125 ± 2) Hz.
    • Beat note measurements confirmed linewidths of 200 Hz and 160 Hz.

    Conclusions:

    • This is the first demonstration of a VECSEL compatible with narrow linewidths (few hundred Hz) for atom and ion cooling.
    • The developed VECSEL system offers a promising solution for advanced atomic physics experiments.