Mx Magnetometry Optimisation in Unshielded Environments

Optically pumped magnetometry in unshielded environments is potentially of great advantage in a wide range of surveying and security applications. Optimisation of OPM modulation schemes and feedback in the $M_x$ scheme offers enhanced sensitivity through noise cancellation and decoherence suppression. The work presented demonstrates capability for software-controlled optimisation of OPM performance in ambient fields in the $0.5 G$ range. Effects on magnetometer bandwidth and sensitivity are discussed.