Atomic transitions of Rb, $D_2$ line in strong magnetic fields: hyperfine Paschen-Back regime

Abstract

An efficient $\lambda /2$-method ($\lambda$ is the resonant wavelength of laser radiation) based on nanometric-thickness cell filled with rubidium is implemented to study the splitting of hyperfine transitions of ${}^{85}$Rb and ${}^{87}$Rb $D_2$ lines in an external magnetic field in the range of $B=3$~kG -- 7~kG. It is experimentally demonstrated that at $B>3$~kG from 38 (22) Zeeman transitions allowed at low $B$-field in ${}^{85}$Rb (${}^{87}$Rb) spectra in the case of ${\sigma }^{+}$ polarized laser radiation there remain only 12 (8) which is caused by decoupling of the total electronic momentum $\text{J}$ and the nuclear spin momentum $\text{I}$ (hyperfine Paschen-Back regime). Note that at $B>4.5$~kG in the absorption spectrum these $20$ atomic transitions are regrouped in two completely separate groups of $10$ atomic transitions each. Their frequency positions and fixed (within each group) frequency slopes, as well as the probability characteristics are determined. A unique behavior of the atomic transitions of ${}^{85}$Rb and ${}^{87}$Rb labeled $19$ and $20$ (for low magnetic field they could be presented as transitions $F_g=3,m_F=+3\to F_e=4,m_F=+4$ and $F_g=2,m_F=+2\to F_e=3,m_F=+3$, correspondingly) is stressed. The experiment agrees well with the theory. Comparison of the behavior of atomic transitions for $D_2$ line compared with that of $D_1$ line is presented. Possible applications are described.

arXiv comment13 pages, 6 figures

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• Simultaneous two-photon resonant optical laser locking (STROLLing) in the hyperfine Paschen--Back regime
• Magnetic field--induced modification of selection rules for Rb D${}_2$ line monitored by selective reflection from a vapor nanocell
• Precision Measurement of the Excited State Landé g-factor and Diamagnetic Shift of the Cesium D${}_2$ Line
• Nonlinear Zeeman Effects in the Cavity-Enhanced Emission of Polarised Photons
• Sub-Doppler spectra of sodium $D$ lines in a wide range of magnetic field: theoretical study