A digital alkali spin maser

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
29 Downloads (Pure)

Abstract

Self-oscillating atomic magnetometers, in which the precession of atomic spins in a magnetic field is driven by resonant modulation, offer high sensitivity and dynamic range. Phase-coherent feedback from the detected signal to the applied modulation creates a resonant spin maser system, highly responsive to changes in the background magnetic field. Here we show a system in which the phase condition for resonant precession is met by digital signal processing integrated into the maser feedback loop. This system uses a modest chip-scale laser and mass-produced dual-pass caesium vapour cell and operates in a 50 μT field, making it a suitable technology for portable measurements of the geophysical magnetic field. We demonstrate a Cramér-Rao lower bound-limited resolution of 50 fT at 1 s sampling cadence, and a sensor bandwidth of 10 kHz. This device also represents an important class of atomic system in which low-latency digital processing forms an integral part of a coherently-driven quantum system.

Original languageEnglish
Article number12888
Number of pages7
JournalScientific Reports
Volume12
Issue number1
DOIs
Publication statusPublished - 28 Jul 2022

Keywords

  • spin maser
  • optically pumped magnetometer (OPM)
  • spin precession
  • digital signal processing

Fingerprint

Dive into the research topics of 'A digital alkali spin maser'. Together they form a unique fingerprint.

Cite this