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    Area of Science:

    • Atomic physics
    • Quantum sensing
    • Magnetometry

    Background:

    • Atomic magnetometers offer high sensitivity for measuring magnetic fields.
    • Spin-exchange relaxation can limit magnetometer performance.
    • Optimizing optical pumping techniques is crucial for enhanced sensitivity.

    Purpose of the Study:

    • To demonstrate an improved atomic magnetometer using amplitude-modulated pumping and hyperfine repumping.
    • To enhance the signal amplitude and reduce the linewidth of magnetic resonance.
    • To achieve sub-fT sensitivity in the Earth-field range at room temperature.

    Main Methods:

    • Utilizing a paraffin-coated cell for atomic vapor.
    • Implementing amplitude-modulated pumping and hyperfine repumping beams.
    • Exploiting constructive interference between polarized spins.

    Main Results:

    • Observed a three-fold increase in magnetic resonance amplitude.
    • Achieved an approximate two-fold reduction in linewidth.
    • Demonstrated suppression of spin-exchange relaxation.

    Conclusions:

    • The developed technique significantly improves magnetometer sensitivity.
    • This method offers a promising route towards SERF-like (Spin-Exchange Relaxation Free) magnetometry.
    • Sub-fT-level sensitivity is achievable in a room-temperature, Earth-field environment.