An Optically Pumped Magnetometer Working in the Light-Shift Dispersed Mz Mode

Area of Science:

• Atomic physics
• Magnetometry
• Optical instrumentation

Background:

• Optically pumped magnetometers (OPMs) are sensitive magnetic field sensors.
• Existing OPMs face limitations in achieving ultra-high magnetic field resolution.
• The Mz configuration and light-shift effects are key parameters in OPM performance.

Purpose of the Study:

• To introduce and characterize a novel operational mode for optically pumped magnetometers: the light-shift dispersed Mz (LSD-Mz) mode.
• To optimize the LSD-Mz magnetometer's configuration for maximum sensitivity and resolution.
• To determine the best achievable shot-noise-limited magnetic field resolution.

Main Methods:

• Implementation of a new operational mode (LSD-Mz) combining high-power off-resonant optical pumping and Mz configuration.
• Utilizing an integrated array of two small alkali metal vapor cells with opposite helicity pumping.
• Employing Latin Hypercube Sampling for sensitivity analysis of input parameters.
• Assessing multi-dimensional parameter space exploration data for optimal configuration.

Main Results:

• The LSD-Mz magnetometer's performance is governed by a complex interplay of input parameters.
• Sensitivity analysis identified optimal configurations for magnetometer resolution.
• A magnetic field resolution below 10 fT/√Hz was achieved using two 50 mm³ integrated vapor cells.
• This resolution was determined within Earth's magnetic field strength.

Conclusions:

• The developed LSD-Mz mode offers a significant advancement in optically pumped magnetometer sensitivity.
• The study successfully identified optimal operational parameters for the LSD-Mz magnetometer.
• The demonstrated resolution of <10 fT/√Hz represents a breakthrough for sensitive magnetic field detection.