Single-beam highly sensitive magnetic field gradiometer based on the atomic spin-exchange relaxation-free effect

Area of Science:

• Atomic Physics
• Magnetometry
• Optical Sensing

Background:

• Atomic magnetometers based on the spin-exchange relaxation-free (SERF) effect offer high sensitivity.
• Conventional magnetic field gradient measurements often employ two-probe or two-beam configurations.
• Existing methods can be affected by variations in detected optical power.

Purpose of the Study:

• To develop a highly sensitive single-beam atomic magnetic field gradiometer.
• To leverage the atomic SERF effect for improved magnetic field gradient measurement.
• To enable two-dimensional gradient measurements with a simplified design.

Main Methods:

• Utilized a single-beam atomic magnetic field gradiometer.
• Employed a reflective detection optical path structure.
• Incorporated an angular cone prism and a quarter-wave plate for signal manipulation and 2D measurement.

Main Results:

• Achieved higher sensitivity compared to conventional two-probe or two-beam gradiometers.
• Demonstrated robustness against variations in detected optical power.
• Successfully implemented two-dimensional magnetic field gradient measurements.

Conclusions:

• The single-beam atomic SERF gradiometer offers superior sensitivity and reliability.
• The reflective optical path and angular cone prism facilitate a simple yet effective 2D measurement system.
• This technology presents a significant advancement in high-precision magnetic field gradient sensing.