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    A new optical system for cold atom interferometry sensors offers superior integration and stability. This compact, robust system enables precise gravity measurements and supports practical applications for inertial sensors.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Geophysics and Geodesy

    Background:

    • Cold atom interferometry is crucial for advanced inertial sensors.
    • Real-world applications require highly integrated and stable optical systems.

    Purpose of the Study:

    • To develop a compact, stable, and highly integrated optical system for a fountain-type Rubidium-85 (85Rb) atom gravimeter.
    • To demonstrate the system's robustness and suitability for practical deployment.

    Main Methods:

    • Utilized dual fiber laser outputs to generate all necessary laser beams.
    • Employed miniaturized optical components bonded onto quartz glass plates for reduced volume.
    • Integrated the optical system into a compact chassis (43 cm × 42 cm × 13 cm).

    Main Results:

    • Achieved a gravity measurement sensitivity of 14.5 µGal/√Hz.
    • Demonstrated long-term stability of 0.4 µGal over 2560 seconds.
    • The system maintained functionality after transportation over 14,000 km without adjustments.

    Conclusions:

    • The developed optical system offers significant improvements in integration and stability for atom interferometry sensors.
    • The system's robustness and performance facilitate practical applications in gravimetry and other inertial sensing fields.
    • This versatile optical system supports the deployment of various atom interferometry-based sensors in real-world settings.