Proof of the feasibility of a nanocell-based wide-range optical magnetometer

Abstract

We present an experimental scheme performing scalar magnetometry based on the fitting of Rb D${}_2$ line spectra recorded by derivative selective reflection spectroscopy from an optical nanometric-thick cell. To demonstrate its efficiency, the magnetometer is used to measure the inhomogeneous magnetic field produced by a permanent neodimuim-iron-boron alloy ring magnet at different distances. The computational tasks are realized by relatively cheap electronic components: an Arduino Due board for the external control of the laser and acquisition of spectra, and a Raspberry Pi computer for the fitting. The coefficient of variation of the measurements remains under $5\%$ in the magnetic field range of 40 - 200 mT, limited only by the size of the oven and translation stage used in our experiment. The proposed scheme is expected to operate with a high measurement precision also for stronger magnetic fields ($>500$mT), in the hyperfine Paschen-Back regime, where the evolution of the atomic transitions can be calculated with a high accuracy.

6 pages, 2 figures

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• Wide range linear magnetometer based on a sub-microsized K vapor cell
• Sub-Doppler spectra of sodium $D$ lines in a wide range of magnetic field: theoretical study
• Features of Magnetically-induced atomic transitions of Rb D${}_1$ line studied by Doppler-free method based on the second derivative of the absorption spectra
• New standard magnetic field values determined by cancellations of ${}^{85}\text{Rb}$ and ${}^{87}\text{Rb}$ atomic vapors $5{}^2{S}_{1/2}\to 6{}^2{P}_{1/2,3/2}$ transitions