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Magnetometry using Electromagnetically Induced Transparency in a Room Temperature Vapour Cell - Developing an Optical Magnetometer that Utilises the Steep Dispersion Curve Observed in EIT to Detect Time Varying Magnetic Fields.

Melody R. Blackman, Benjamin T. H. Varcoe

Published Jan 1, 2009• 0 citations
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We develop a generalized principle of electromagnetically induced transparency (EIT) vector magnetometry based on high-contrast EIT resonances and the symmetry of atom-light interaction in the linearly polarized bichromatic fields. Operation of such vector magnetometer on the D1{D}_{1}D1​ line of 87Rb^{87}\mathrm{Rb}87Rb has been demonstrated. The proposed compass-magnetometer has an increased immunity to shifts produced by quadratic Zeeman and ac-Stark effects, as well as by atom-buffer gas and atom-atom collisions. In our proof-of-principle experiment the detected angular sensitivity to magnetic field orientation is ${10}^{\ensuremath{-}3}$ deg/Hz1/2{}^{1/2}1/2, which is limited by laser intensity fluctuations, light polarization quality, and magnitude of the magnetic field.