Complete hyperfine Paschen-Back regime at relatively small magnetic fields realized in Potassium nano-cell

Abstract

A one-dimensional nano-metric-thin cell (NC) filled with potassium metal has been built and used to study optical atomic transitions in external magnetic fields. These studies benefit from the remarkable features of the NC allowing one to use $\lambda /2$- and $\lambda$-methods for effective investigations of individual transitions of the K D_1 line. The methods are based on strong narrowing of the absorption spectrum of the atomic column of thickness L equal to $\lambda /2$ and to $\lambda$(with $λ= 770\un{nm}$ being the resonant laser radiation wavelength). In particular, for a $\pi$-polarized radiation excitation the $\lambda$-method allows us to resolve eight atomic transitions (in two groups of four atomic transitions) and to reveal two remarkable transitions that we call Guiding Transitions (GT). The probabilities of all other transitions inside the group (as well as the frequency slope versus magnetic field) tend to the probability and to the slope of GT. Note that for circular polarization there is one group of four transitions and GT do not exist. Among eight transitions there are also two transitions (forbidden for $B$ = 0) with the probabilities undergoing strong modification under the influence of magnetic fields. Practically the complete hyperfine Paschen-Back regime is observed at relatively low ($\sim 1\un{kG}$) magnetic fields. Note that for K $D_2$ line GT are absent. Theoretical models describe the experiment very well.

6 pages

References in corpus (11)

• Resonant nonlinear magneto-optical effects in atoms
• The cooperative Lamb shift in an atomic nanolayer
• ElecSus: A program to calculate the electric susceptibility of an atomic ensemble
• An optical isolator using an atomic vapor in the hyperfine Paschen-Back regime
• Hyperfine Paschen-Back regime realized in Rb nanocell
• Saturated-absorption spectroscopy revisited: atomic transitions in strong magnetic fields ($>$20 mT) with a micrometer-thin cell
• The hyperfine Paschen-Back Faraday effect
• Giant modification of atomic transitions probabilities induced by magnetic field: forbidden transitions become predominant
• Hyperfine Paschen-Back regime in alkali metal atoms: consistency of two theoretical considerations and experiment
• Study of forbidden atomic transitions on $D_2$ line using Rb nano-cell placed in external magnetic field
• High-Spatial-Resolution Monitoring of Strong Magnetic Field using Rb vapor Nanometric-Thin Cell

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• Electromagnetically induced absorption in a non-degenerate three-level ladder system
• Four-wave mixing in a non-degenerate four-level diamond configuration in the hyperfine Paschen-Back regime
• Absorption spectroscopy and Stokes polarimetry in a ${}^{87}$Rb vapour in the Voigt geometry with a 1.5 T external magnetic field
• Collapse and revival of a Dicke-type coherent narrowing in potassium vapor confined in a nanometric-thin cell
• An atomic Faraday beam splitter for light generated from pump degenerate four-wave mixing in a hollow-core photonic crystal fiber
• Hyperfine Paschen-Back regime of Potassium D${}_2$ line observed by Doppler-free spectroscopy
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• Zeeman-tunable Modulation Transfer Spectroscopy
• Magnetic field--induced modification of selection rules for Rb D${}_2$ line monitored by selective reflection from a vapor nanocell
• Wide range linear magnetometer based on a sub-microsized K vapor cell
• Strongest Magnetically Induced Transitions in Alkali Metal Atoms with nuclear spin $3/2$
• Saturated absorption technique used in Potassium microcell for magnetic field sensing