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Zhurnal Prikladnoi Spektroskopii

FORMATION OF NARROW-BAND N-TYPE OPTICAL RESONANCE IN VAPORS OF POTASSIUM ATOMS

Armen D. Sargsyan

Published Jan 21, 2022• 2 citations
Publisher

Abstract

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.

DOI
10.47612/0514-7506-2022-89-1-17-23

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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.
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.
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.
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.
The N -resonance process is an accessible and effective method for obtaining narrow (down to subnatural linewidth), and contrasted resonances, using two continuous lasers and a Rb vapor cell. In this article, we investigate the impact of buffer gas partial pressure on the contrast and linewidth of N -resonances formed in the D 1 line of a 85 Rb thermal vapor. N -resonances are compared to usual EIT resonances, and we highlight their advantages and disadvantages. Measurements were performed with five vapor cells, each containing Rb and Ne buffer gas with different partial pressures (ranging from 0 to 400 Torr). This reveals the existence of an optimum Ne partial pressure that yields the best contrast, for which we provide a qualitative description. We then study the behavior of the N -resonance components when a transverse magnetic field is applied to the vapor cell. The frequency shift of each component is well described by theoretical calculations. • The N -resonance process allows to obtain narrow and contrasted optical resonances. • Measurements were performed with five vapor cells containing Rb and Ne buffer gas. • N -resonances are compared with EIT resonances, and we highlight their advantages. • The N -resonance behavior when a magnetic field is applied to the vapor cell is studied. • A qualitative explanation of the formation of the N -resonance is given.
N-type resonances excited in rubidium atoms confined in micrometric-thin cells with variable thickness from 1 μm to 2 mm are studied experimentally for the cases of a pure Rb atomic vapor and of a vapor with neon buffer gas. Good contrast and narrow linewidth were obtained for thicknesses as low as 30 μm. The higher amplitude and sharper profile of N-type resonances in the case of a buffered cell was exploited to study the splitting of the 85Rb D1 N-resonance in a magnetic field of up to 2200 G. The results are fully consistent with the theory. The mechanism responsible for forming N-resonances is discussed. Possible applications are addressed.
Comparison of absorption and fluorescence in a nano-cell containing Rb vapor with other Rb nano-cells with addition of neon gas is presented. It is shown that the effect of collapse and revival of Dicke-type narrowing occurs for Rb nanocells containing N2 as buffer gas under 6 and 20 Torr pressure for the thickness L = λ /2 and L = where λ is the resonant λ, laser wavelength 794 nm (D1 line). Particularly for 6 Torr the line-width of the transmission spectrum for the thickness L =λ/2 is 2 times narrower than that for L = λ. For an ordinary Rb cell with L = 0.1 - 10 cm with addition of buffer gas, the velocity selective optical pumping/saturation (VSOP) resonances in saturated absorption spectra are fully suppressed when the buffer gas pressure > 0.5 Torr. A spectacular difference is that for L = λ, VSOP resonances located at the atomic transitions are still observable even when Ne pressure is ≥ 6 Torr. Narrowband fluorescence spectra of a nano-cell with L = λ/2 can be used as a convenient tool for online buffer gas pressure monitoring for the conditions when ordinary pressure gauges are unusable. Comparison of electromagnetically induced transparency (EIT) effect in a nano-cell filled with pure (without a buffer gas) Rb with another nano-cell, where buffer gas nitrogen is added, is presented. The use of N2 gas inside Rb nano-cells strongly extends the range of coupling laser detunings in which it is still possible to form EIT resonance.