Harmonic detection of magnetic resonance for sensitivity improvement of optical atomic magnetometers

Highly sensitive atomic magnetometers use optically detected magnetic resonance of atomic spins to measure extremely weak magnetic field changes. The magnetometer sensitivity is directly proportional to the ratio of intensity to line-shape of the resonance signal. To obtain narrower resonance signal...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2017-02, Vol.424, p.284-290
Main Authors: Ranjbaran, M., Tehranchi, M.M., Hamidi, S.M., Khalkhali, S.M.H.
Format: Article
Language:English
Subjects:
Atomic magnetometers
Atomic physics
Bloch equations
Harmonic detection of magnetic resonance
Higher harmonics
Magnetic fields
Magnetic measurement
Magnetic resonance
Magnetometers
NMR
Nuclear magnetic resonance
Sensitivity
Systems design
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Summary:Highly sensitive atomic magnetometers use optically detected magnetic resonance of atomic spins to measure extremely weak magnetic field changes. The magnetometer sensitivity is directly proportional to the ratio of intensity to line-shape of the resonance signal. To obtain narrower resonance signal, we implemented harmonic detection of magnetic resonance method in Mx configuration. The nonlinear spin polarization dynamics in detection of the higher harmonics were employed in phenomenological Bloch equations. The measured and simulated harmonic components of the resonance signals in frequency domain yielded significantly narrower line-width accompanying much improved sensitivity. Our results confirm the sensitivity improvement by a factor of two in optical atomic magnetometer via second harmonic signal which can open a new insight in the weak magnetic field measurement system design. •Highly sensitive atomic magnetometers have been used to measure weak magentic filed.•To obtain narrower resonance signal, we impalnted harmonic detection of magnetic resonance.•The nonlinear spin polarization dynamics in detetion of the higher harmonics were imployed.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2016.10.058