Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 28, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6501/aa58b4
Keywords
atomic magnetometer; fT sensitivity; optically pumped magnetometer; single-beam configuration; high-frequency operation
Funding
- US DOE through the LANL/LDRD program
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Optically pumped magnetometers (OPM) can be used in various applications, from magnetoencephalography to magnetic resonance imaging and nuclear quadrupole resonance (NQR). OPMs provide high sensitivity and have the significant advantage of non-cryogenic operation. To date, many magnetometers have been demonstrated with sensitivity close to 1 fT, but most devices are not commercialized. Most recently, QuSpin developed a model of OPM that is low cost, high sensitivity, and convenient for users, which operates in a singlebeam configuration. Here we developed a theory of single-beam (or parallel two-beam) magnetometers and showed that it is possible to achieve good sensitivity beyond their usual frequency range by tuning the magnetic field. Experimentally we have tested and optimized a QuSpin OPM for operation in the frequency range from DC to 1.7 kHz, and found that the performance was only slightly inferior despite the expected decrease due to deviation from the spin-exchange relaxation-free regime.
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