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arXiv:1309.4420 · Journal of Physics B Atomic Molecular and Optical Physics

Sub-natural width N-type resonance in cesium atomic vapour: splitting in magnetic fields

Dimitar Slavov, Armen D. Sargsyan, David G. Sarkisyan, R. Mirzoyan, A. Krasteva, Arlene D Wilson-Gordon, S. Cartaleva

Published Jan 10, 2014• 15 citations
arXivHTMLPDF

Abstract

The sub-natural width N -type resonance in a Λ-system, on the D 2 line of Cs atoms is studied for the first time in the presence of a buffer gas (neon) and the radiations of two continuous narrow-band diode lasers. A L = 1 cm long cell is used to investigate the N -type process. The N -type resonance in a magnetic field for 133 Cs atoms is shown to split into seven or eight components, depending on the magnetic field and laser radiation directions. The results obtained indicate that the levels F g = 3, 4 are the initial and final ones in the N -resonance formation. The experimental results with magnetic field agree well with theoretical descriptions.

DOI
10.1088/0953-4075/47/3/035001

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Journal of Contemporary Physics (Armenian Academy of Sciences)•Dec 27, 2012•0 citations
The sub-natural width N -type resonance in a Λ-system, on the D 2 line of Cs atoms is studied for the first time in the presence of a buffer gas (neon) and the radiations of two continuous narrow-band diode lasers. A L = 1 cm long cell is used to investigate the N -type process. The N -type resonance in a magnetic field for 133 Cs atoms is shown to split into seven or eight components, depending on the magnetic field and laser radiation directions. The results obtained indicate that the levels F g = 3, 4 are the initial and final ones in the N -resonance formation. The experimental results with magnetic field agree well with theoretical descriptions.
The narrow-band N-resonance formed in a Λ system of D 1-line rubidium atoms is studied in the presence of a buffer gas (neon) and the radiations of two continuous narrow-band diode lasers. Special-purpose cells are used to investigate the dependence of the process on vapor column thickness L in millimeter, micrometer, and nanometer ranges. A comparison of the dependences of the N-resonance and the electromagnetically induced transparency (EIT) resonance on L demonstrates that the minimum (record) thickness at which the N-resonance can be detected is L = 50 μm and that a high-contrast EIT resonance can easily be formed even at L ≈ 800 nm. The N-resonance in a magnetic field for 85Rb atoms is shown to split into five or six components depending on the magnetic field and laser radiation directions. The results obtained indicate that levels F g = 2, 3 are initial and final in the N-resonance formation. The dependence of the N-resonance on the angle between the laser beams is analyzed, and practical applications are noted.
An N-type optical resonance formed in the Л-system of potassium atoms (D1 lines) using two CW narrow-band lasers, a spectroscopic cell with a length of 1.5 cm which contains vapors of potassium atoms, and a buffer neon gas with a partial pressure of 20 Torr has been investigated. It is shown that the N-type resonance splits into three equidistant components in a longitudinal magnetic field. A comparison of the N-type resonance parameters formed in the vapors of cesium and rubidium atoms has been presented. It is found that when the N-type resonance is formed, the initial and final levels are the lower ground levels Fg = 1, 2.
Features of electromagnetically induced transparency (EIT) in potassium vapors at the D 1 line of the 39 K isotope are studied. EIT resonances with a subnatural width of 3.5 MHz have been recorded upon excitation by two independent narrow-band diode lasers in a 1-cm-long cell filled with a natural mixture of potassium isotopes and buffer gas. The splitting of EIT resonances in potassium vapors in longitudinal and transverse magnetic fields has been studied for the first time. The splitted components also have a subnatural width. The smallness of the coupling factor of the hyperfine structure in 39 K atoms leads to a transition to the Paschen—Back regime at relatively weaker magnetic fields than in the case of Cs, Rb, and Na atoms. Practical applications of the phenomena under study are noted. The theoretical model well explains the experiment.
Electromagnetically induced transparency (EIT) resonance in strong magnetic fields of up to 1.7 kG has been investigated with the use of a 30-μm cell filled with an atomic rubidium vapor and neon as a buffer gas. The EIT resonance in the Λ system of the D 1 line of 85 Rb atoms has been formed with the use of two narrowband (∼1 MHz) 795-nm diode lasers. The EIT resonance in a longitudinal magnetic field is split into five components. It has been demonstrated that the frequencies of the five EIT components are either blue- or red-shifted with an increase in the magnetic field, depending on the frequency ν P of the probe laser. In has been shown that in both cases the 85 Rb atoms enter the hyperfine Paschen-Back regime in magnetic fields of >1 kG. The hyperfine Paschen-Back regime is manifested by the frequency slopes of all five EIT components asymptotically approaching the same fixed value. The experiment agrees well with the theory.