Differential Atomic Magnetometry Based on a Diverging Laser Beam
Eleanor Hodby, Elizabeth A. Donley, John E. Kitching
We demonstrate a novel atomic magnetometer that uses differential detection of the spatially diverging components of a light field to monitor the Larmor precession frequency of atoms in a thermal vapor. The design is implemented in compact form with a micromachined alkali vapor cell and a naturally divergent light field emitted by a vertical cavity surface emitting laser, which serves to both optically pump the atoms and measure the transverse polarization. Operating the magnetometer in differential mode cancels common-mode noise and improves the sensitivity by a factor of 26 over single-channel operation. We also suggest ways in which the current sensitivity of 28\,pT/$\surd$Hz may be improved further without sacrificing size or simplicity.
, Donley, E.
and Kitching, J.
Differential Atomic Magnetometry Based on a Diverging Laser Beam, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50501
(Accessed September 30, 2023)