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Licensed Unlicensed Requires Authentication Published by De Gruyter October 19, 2019

Fast and robust optically pumped cesium magnetometer

Victor Lebedev, Stefan Hartwig and Thomas Middelmann

Abstract

We present a fast and robust optically pumped magnetometer that is based on a feedback-controlled spin ensemble of cesium atoms in spin-polarized vapor. The table-top system is intended for operation in unshielded environment, and its design allows conversion into a handheld sensor head. Under strongly disturbed environmental conditions in the laboratory, the sensor exhibits a speed of more than 56 kHz, while having a slew rate of 39 mT/s and a full dynamic range of 10 – 120 μT. Under these conditions a sensitivity of 33 pT/Hz is reached. By reducing the speed to 3.6 kHz the sensitivity can be improved to 6 pT/Hz, which is close to the shot noise limit. We describe the sensor design and its optimization and demonstrate the performance of the sensor under conditions appropriate for magnetic susceptometry measurements.


Corresponding author: Victor Lebedev, Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, D-10587 Berlin, Germany, E-mail:

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

Appendix A. Explicit form of Ω(ϕ)  relation

Physical phase-frequency relation resulting from Eq. (4) takes form:

Ω(ϕ)=tanϕc323T223(T2tan2ϕ3)c,a=27T4(tanϕ2Kϕ)+2T6tan3ϕ9T4tanϕ,b=a24T2(T2tan2ϕ3)3,c=a+b3.

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Received: 2020-05-31
Accepted: 2020-07-28
Published Online: 2019-10-19
Published in Print: 2020-11-26

© 2020 Walter de Gruyter GmbH, Berlin/Boston