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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.
|Number of pages||7|
|Publication status||Published - 28 Jul 2022|
- spin maser
- optically pumped magnetometer (OPM)
- spin precession
- digital signal processing
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- 1 Active
UK National Quantum Technology Hub in Sensors and Timing
Riis, E., Arnold, A., Griffin, P. & Hastie, J.
EPSRC (Engineering and Physical Sciences Research Council)
1/12/19 → 30/11/24
Data for: "A Digital Alkali Spin Maser"
Ingleby, S. (Creator), University of Strathclyde, 25 Apr 2022