Bell-Bloom Magnetometer Linearization by Intensity Modulation CancellationIEEE Transactions on Instrumentation and Measurement.
This paper describes a technique for enhancing the linearity of a Bell-Bloom optical magnetometer. Both the Mₓ and Bell-Bloom magnetometers are examined, and the characteristics of their photodetector signals are compared. It is noted that the phase signal has better linearity than the quadrature amplitude signal for a Mₓ magnetometer, while phase and quadrature amplitude give similar performance in Bell-Bloom.
A cancellation technique is proposed whereby the laser intensity modulation of Bell-Bloom is mitigated to improve the linearity. A cesium microfabricated atomic magnetometer in a frequency-locked-loop configuration is demonstrated, and the improved slew rate and frequency-domain linearity are shown. This linearity enhancement should prove useful for operating atomic magnetometers in interference-rich environments outside of magnetic shields.
The article was published in: IEEE Transactions on Instrumentation and Measurement.
This work was supported (in part) by the Fetzer Franklin Fund of the John E. Fetzer Memorial Trust.