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Reducing Cavity-Pulling Shift in Ramsey-Operated Compact Clocks.

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    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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    Summary
    This summary is machine-generated.

    We developed a new method to stabilize microwave field amplitude in atomic clocks using the atoms themselves as discriminators. This technique improves clock frequency stability for medium and long-term applications.

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    Area of Science:

    • Atomic physics
    • Metrology

    Background:

    • Compact atomic clocks are crucial for precise timekeeping.
    • Ramsey's method is a standard approach for atomic clock operation.
    • Microwave field amplitude fluctuations can degrade clock stability through cavity pulling.

    Purpose of the Study:

    • To present a novel method for stabilizing the microwave field amplitude in compact atomic clocks.
    • To reduce frequency instability caused by microwave amplitude fluctuations.
    • To enhance the medium and long-term stability of atomic clocks.

    Main Methods:

    • Utilizing the pulsed regime of Ramsey's method.
    • Employing atoms as microwave amplitude discriminators.
    • Exploiting the dependence of the atomic signal on microwave pulse area for active stabilization.
    • Locking the local oscillator frequency to the atomic reference.

    Main Results:

    • Successfully demonstrated a method to stabilize microwave field amplitude.
    • Reduced microwave field amplitude fluctuations.
    • Observed improved clock frequency stability on medium and long term.
    • Validated the technique on a vapor-cell atomic clock with hot atoms.

    Conclusions:

    • The proposed technique effectively stabilizes microwave field amplitude in compact atomic clocks.
    • This method enhances atomic clock frequency stability by mitigating cavity pulling effects.
    • The technique is adaptable for both hot-atom vapor-cell and cold-atom compact clocks.