# Subfemtotesla Scalar Atomic Magnetometry Using Multipass Cells

## Author(s): Sheng, D; Li, S; Dural, N; Romalis, Michael V

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 Abstract: Scalar atomic magnetometers have many attractive features but their sensitivity has been relatively poor. We describe a Rb scalar gradiometer using two multipass optical cells. We use a pump-probe measurement scheme to suppress spin-exchange relaxation and two probe pulses to find the spin precession zero crossing times with a resolution of 1 psec. We realize a magnetic field sensitivity of 0: 54 fT/Hz(1/2), which improves by an order of magnitude the best scalar magnetometer sensitivity and exceeds, for example, the quantum limit set by the spin-exchange collisions for a scalar magnetometer with the same measurement volume operating in a continuous regime. DOI: 10.1103/PhysRevLett.110.160802 Publication Date: 19-Apr-2013 Electronic Publication Date: 18-Apr-2013 Citation: Sheng, D, Li, S, Dural, N, Romalis, MV. (2013). Subfemtotesla Scalar Atomic Magnetometry Using Multipass Cells. PHYSICAL REVIEW LETTERS, 110 (10.1103/PhysRevLett.110.160802 DOI: doi:10.1103/PhysRevLett.110.160802 ISSN: 0031-9007 EISSN: 1079-7114 Type of Material: Journal Article Journal/Proceeding Title: PHYSICAL REVIEW LETTERS Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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