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    We developed a new detection method for optically pumped magnetometers to reduce inaccuracies caused by light-atom interactions. This technique improves the precision of atomic magnetometry by monitoring spin dynamics during a dark interval.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Metrology and Measurement Science

    Background:

    • Optically pumped magnetometers (OPMs) are susceptible to systematic errors.
    • Light-atom interactions during spin preparation and readout stages introduce inaccuracies in OPMs.

    Purpose of the Study:

    • To demonstrate a novel detection strategy for OPMs.
    • To suppress systematic errors arising from light-atom interactions in OPMs.

    Main Methods:

    • Utilized a pulsed free-induction-decay (FID) modality with an interrogation sequence.
    • Monitored the dynamics of preoriented atomic spins during an unperturbed dark interval.
    • Applied a time-delayed optical pulse to infer the spin state's phase.

    Main Results:

    • Reduced light shift inaccuracies to within 0.6 nanotesla (nT).
    • Demonstrated a novel detection strategy suppressing systematic errors.

    Conclusions:

    • The developed detection mode significantly enhances the accuracy of OPMs.
    • This technique is applicable to a wide range of high-precision atomic magnetometry experiments.