All-optical atomic magnetometry using an elliptically polarized amplitude-modulated light wave

• URL: http://arxiv.org/abs/2408.01968v1
• Date: Sun, 4 Aug 2024 09:09:08 GMT
• Title: All-optical atomic magnetometry using an elliptically polarized amplitude-modulated light wave
• Authors: Anton Makarov, Katerina Kozlova, Denis Brazhnikov, Vladislav Vishnyakov, Andrey Goncharov,
• Abstract summary: We study a resonant interaction of an elliptically polarized light wave with vapor exposed to a magnetic field. The sensitivity of the magnetic field sensor is estimated to be $approx,$$130$fT/$surd$Hz in a $2$kHz bandwidth. The results can be used to develop a miniature all-optical magnetic field sensor for medicine and geophysics.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study a resonant interaction of an elliptically polarized light wave with $^{87}$Rb vapor (D$_1$ line) exposed to a transverse magnetic field. A $5$$\times$$5$$\times$$5$~mm$^3$ glass vapor cell is used for the experiments. The wave intensity is modulated at the frequency $\Omega_m$. By scanning $\Omega_m$ near the Larmor frequency $\Omega_L$, a magnetic resonance (MR) can be observed as a change in the ellipticity parameter of the wave polarization. This method for observing MR allows to significantly improve the signal-to-noise ratio compared to a classical Bell-Bloom scheme using a circularly polarized wave. The sensitivity of the magnetic field sensor is estimated to be $\approx\,$$130$~fT/$\surd$Hz in a $2$~kHz bandwidth, confidently competing with widely used Faraday-rotation Bell-Bloom schemes. The results can be used to develop a miniature all-optical magnetic field sensor for medicine and geophysics.

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