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

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.