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Wide range linear magnetometer based on a sub-microsized K vapor cell.

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    This study presents a new method for measuring magnetic fields up to 10 kG with micrometer resolution using potassium-39 atoms. The technique is particularly useful for mapping magnetic fields with steep gradients.

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    Area of Science:

    • Atomic Physics
    • Quantum Optics
    • Magnetometry

    Background:

    • Potassium-39 (K-39) atoms exhibit unique hyperfine splitting properties.
    • The hyperfine Paschen-Back regime simplifies spectral analysis in applied magnetic fields.
    • Sub-microsized vapor cells enable high-resolution atomic spectroscopy.

    Purpose of the Study:

    • To develop a novel method for precise magnetic field measurement.
    • To achieve micrometer spatial resolution in magnetic field mapping.
    • To investigate K-39 atomic transitions in strong magnetic fields.

    Main Methods:

    • Utilizing the D1 line absorption spectrum of K-39 atoms.
    • Operating in the hyperfine Paschen-Back regime (B >> B0).
    • Employing sub-microsized vapor cells (120-390 nm thickness) and spectrally resolved atomic transitions.

    Main Results:

    • Observed only eight Zeeman transitions for K-39 in the D1 line absorption spectrum.
    • Achieved magnetic field measurement in the range of 0.1-10 kG.
    • Demonstrated micrometer spatial resolution, capable of resolving gradients up to 3 G/µm.

    Conclusions:

    • The developed method provides accurate magnetic field measurements with high spatial resolution.
    • The findings are significant for applications requiring detailed magnetic field mapping, especially with large gradients.
    • The theoretical model accurately predicts the experimental observations.