Detection of radio frequency magnetic fields using nonlinear magneto-optical rotation

Abstract

We describe a room-temperature alkali-metal atomic magnetometer for detection of small, high frequency magnetic fields. The magnetometer operates by detecting optical rotation due to the precession of an aligned ground state in the presence of a small oscillating magnetic field. The resonance frequency of the magnetometer can be adjusted to any desired value by tuning the bias magnetic field. We demonstrate a sensitivity of $100pG/\sqrt{\mathrm{Hz}}(\mathrm{RMS})$ in a 3.5 cm diameter, paraffin coated cell. Based on detection at the photon shot-noise limit, we project a sensitivity of $20pG/\sqrt{\mathrm{Hz}}(\mathrm{RMS})$.

6 pages, 6 figures

References in corpus (2)

• Nonlinear magneto-optical rotation with frequency-modulated light in the geophysical field range
• Influence of magnetic-field inhomogeneity on nonlinear magneto-optical resonances

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• Alignment-based optically pumped magnetometer using a buffer gas cell
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• Interaction of vector light beams with atoms exposed to a time-dependent magnetic field
• Polarisation of radio-frequency magnetic fields in magnetic induction measurements with an atomic magnetometer
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• Rubidium dimers in paraffin-coated cells
• Optimal and efficient inference tools for field tracking with precessing spins
• Measuring magnetic field inside a microwave cavity via Rabi resonances in Cs atoms