Highly stable atomic vector magnetometer based on free spin precession

Area of Science:

• Atomic physics
• Magnetometry
• Optical pumping

Background:

• Accurate magnetic field measurements are crucial in various scientific and technological fields.
• Existing magnetometers may face limitations in long-term stability or resolution.

Purpose of the Study:

• To develop and characterize a novel magnetometer based on optically pumped Cesium (Cs) atoms.
• To achieve high scalar and directional resolution for measuring microtesla (μT) magnetic fields.

Main Methods:

• Utilized optically pumped Cesium (Cs) atoms as the sensing medium.
• Employed multiple circularly polarized laser beams to probe atomic spin precession.
• Optimized the magnetometer design for long-time stability.

Main Results:

• Achieved a scalar resolution better than 300 fT over integration times from 80 ms to 1000 s.
• Demonstrated a best scalar resolution of less than 80 fT with 1.6 to 6 s integration.
• Measured magnetic field direction with a resolution better than 10 μrad for integration times up to 2000 s.

Conclusions:

• The developed Cs atom magnetometer provides excellent long-time stability and high resolution.
• This technology is suitable for precise measurements of microtesla magnetic fields.
• The magnetometer shows promise for applications requiring sensitive and stable magnetic field detection.