Optical spectroscopy of a microsized Rb vapour sample in magnetic fields up to 58 tesla

Abstract

We use a magnetometer probe based on the Zeeman shift of the rubidium resonant optical transition to explore the atomic magnetic response for a wide range of field values. We record optical spectra for fields from few tesla up to 60 tesla, the limit of the coil producing the magnetic field. The atomic absorption is detected by the fluorescence emissions from a very small region with a submillimiter size. We investigate a wide range of magnetic interactions from the hyperfine Paschen-Back regime to the fine one, and the transitions between them. The magnetic field measurement is based on the rubidium absorption itself. The rubidium spectroscopic constants were previously measured with high precision, except the excited state Landé $g$-factor that we derive from the position of the absorption lines in the transition to the fine Paschen-Back regime. Our spectroscopic investigation, even if limited by the Doppler broadening of the absorption lines, measures the field with a 20 ppm uncertainty at the explored high magnetic fields. Its accuracy is limited to 75 ppm by the excited state Landé $g$-factor determination.

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• Precision Measurement of the Excited State Landé g-factor and Diamagnetic Shift of the Cesium D${}_2$ Line
• Measurement of the ratio between g-factors of the ground states of ${}^{87}$Rb and ${}^{85}$Rb
• Voigt transmission windows in optically thick atomic vapours: a method to create single-peaked line centre filters
• Indirect measurement of atomic magneto-optical rotation via Hilbert transform