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Loop-locked coherent population trapping magnetometer based on a fiber electro-optic modulator.

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    We developed a coherent population trapping (CPT) magnetometer using ⁸⁷Rb atoms. This device achieves high sensitivity, matching commercial magnetometers for precise magnetic field measurements.

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    Area of Science:

    • Atomic Physics
    • Quantum Optics
    • Magnetometry

    Background:

    • Coherent Population Trapping (CPT) offers a sensitive method for atomic-based sensing.
    • Magnetometers are crucial for detecting and measuring magnetic fields in various scientific and technological applications.

    Purpose of the Study:

    • To develop and characterize a novel CPT-based magnetometer prototype.
    • To evaluate the performance of the magnetometer against established measurement techniques.

    Main Methods:

    • Utilized ⁸⁷Rb atoms and the D1 atomic line for CPT.
    • Employed a fiber electro-optic modulator (FEOM) for generating a dichromatic light field.
    • Implemented a feedback loop with a proportional integral controller to lock the CPT resonance to the magnetic field.

    Main Results:

    • Observed a CPT resonance signal with a narrow linewidth of 516 Hz.
    • Achieved measurement data well-matched with a commercial fluxgate magnetometer (within 2 nT).
    • Demonstrated a sensitivity better than 8 pT/√Hz in a parallel magnetic field.

    Conclusions:

    • The developed CPT magnetometer prototype shows promising performance for accurate magnetic field measurements.
    • The device exhibits high sensitivity and good agreement with commercial standards.
    • This work contributes to the advancement of atomic magnetometry.