Free-induction-decay magnetometer based on a microfabricated Cs vapor cell

D. Hunter, S. Piccolomo, J. D. Pritchard, N. L. Brockie, T. E. Dyer, E. Riis

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We describe an optically pumped Cs magnetometer containing a 1.5 mm thick microfabricated vapor cell with nitrogen buffer gas operating in a free-induction-decay (FID) configuration. This allows us to monitor the free Larmor precession of the spin coherent Cs atoms by separating the pump and probe phases in the time domain. A single light pulse can sufficiently polarize the atomic sample however, synchronous modulation of the light field actively drives the precession and maximizes the induced spin coherence. Both amplitude and frequency modulation have been implemented with noise floors of 3 pT / √ Hz and 16 pT / √ Hz respectively within the Nyquist limited bandwidth of 500 Hz .
Original languageEnglish
Article number014002
Number of pages10
JournalPhysical Review Applied
Issue number10
Early online date5 Jul 2018
Publication statusE-pub ahead of print - 5 Jul 2018


  • atomic physics
  • optical spectroscopy
  • optical pumping
  • Zeeman effect
  • Larmor spin precession
  • metrology


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