High-bandwidth optical magnetometer

Abstract

We demonstrate a scalar ${}^{87}\mathrm{Rb}$ optical magnetometer that retains magnetic-field sensitivities below $10\mathrm{pT}/\surd \mathrm{Hz}$ over 3 dB bandwidths of 10 kHz in an ambient field $B_o=11.4\mathrm{\mu T}$ and using a measurement volume of $1{\mathrm{mm}}^3$. The magnetometer operates at high atomic densities where both the sensitivity and the bandwidth are limited by spin-exchange collisions between the alkali atoms. By operating in this regime, our measurements show that the bandwidth of the magnetometer can be increased without a significant degradation in its sensitivity.

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