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Updated: Jan 15, 2026

Picometer-Precision Atomic Position Tracking through Electron Microscopy
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High-accuracy CPT-based atomic magnetometer with compact optical and electronic architecture.

Ruochen Zhang, Renfeng Dai, Hua Liu

    Optics Letters
    |October 15, 2025
    PubMed
    Summary

    We developed a compact atomic magnetometer using CPT and a modulated laser for sensitive magnetic field detection. This portable device offers high accuracy for real-time vector magnetic field sensing.

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    Area of Science:

    • Atomic physics and quantum sensing.
    • Development of novel magnetic field sensors.

    Background:

    • Atomic magnetometers offer high sensitivity for magnetic field measurements.
    • Existing technologies may lack portability or real-time vector sensing capabilities.

    Purpose of the Study:

    • To present a compact, high-sensitivity atomic magnetometer.
    • To demonstrate real-time vector magnetic field sensing capabilities.

    Main Methods:

    • Utilized a compact CPT-based atomic magnetometer.
    • Employed a directly modulated Vertical-Cavity Surface-Emitting Laser (VCSEL).
    • Implemented phase-sensitive detection for signal processing.

    Main Results:

    • Achieved a static magnetic field measurement accuracy of 20 pT (1σ).
    • Demonstrated directional consistency exceeding 99.6%.
    • Coil calibration showed linear response matching an Mx-type magnetometer.

    Conclusions:

    • Validated the feasibility of portable, high-sensitivity CPT magnetometers.
    • The developed device is suitable for real-time vector magnetic field sensing.
    • This technology advances compact magnetic sensing applications.