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Frontiers in Optics

Giant Enhancement in Nonlinear Optical-Atomic Magnetometry

Lu Deng, Feng Lei Zhou, E. W. Hagley

Published Jan 1, 2016• 0 citations
Publisher

Abstract

We demonstrate a cross-polarization wave-mixing nonlinear atomic magnetometer that results in >500X optical signal signal-to-noise ratio enhancement with perfect field sensitivity preservation and significant reduction of laser power, opening a myriad of applications in bio-magnetism.
DOI
10.1364/ls.2016.lf2e.7

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The nonlinear magneto-optical effect has significantly impacted modern society with prolific applications ranging from precision mapping of the Earth's magnetic field to bio-magnetic sensing. Pioneering works on collisional spin-exchange effects have led to ultra-high magnetic field detection sensitivities at the level of fT/HzfT/\sqrt{Hz}fT/Hz​ using a single linearly-polarized probe light field. Here we demonstrate a nonlinear Zeeman-coherence parametric wave-mixing optical-atomic magnetometer using room temperature rubidium vapor that results in more than a three-order-of-magnitude optical signal-to-noise ratio (SNR) enhancement for extremely weak magnetic field sensing. This unprecedented enhancement was achieved with nearly a two-order-of-magnitude reduction in laser power while preserving the sensitivity of the widely-used single-probe beam optical-atomic magnetometry method. This new method opens a myriad of applications ranging from bio-magnetic imaging to precision measurement of the magnetic properties of subatomic particles.
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