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Mixed resonance of optical and microwave fields in cesium atomic vapor

Chung Hee Lee, Kyoung Dae Kim, Soo Kyoung Kim, Lim Lee, Hang Hwa Kim, Jung Bog Kim

Published Jul 1, 2002• 0 citations
OpenAlex

Abstract

We have experimentally investigated microwave-optical double resonance in cesium atomic vapor cell with Ne 20 torr buffer gas in the microwave cavity. The double resonance experimental signals are observed with (or without) the external weak magnetic field. The results are explained with Zeeman effect and polarization component in the V-type energy configurations.

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Journal of Experimental and Theoretical Physics Letters•Apr 1, 2006•7 citations
We have experimentally investigated microwave-optical double resonance in cesium atomic vapor cell with Ne 20 torr buffer gas in the microwave cavity. The double resonance experimental signals are observed with (or without) the external weak magnetic field. The results are explained with Zeeman effect and polarization component in the V-type energy configurations.
The absorption of a light wave interacting with optical transitions in the D1line of an alkali metal atom subjected to microwave radiation that is in resonance with magnetic dipole transitions between hyperfine ground-state components, has been investigated. It is known that when scanning a longitudinal magnetic field (B||k, wherekis the wavevector), one may observe a magneto-optical resonance due to the ground-state Hanle effect. In addition, the effect of double radio-optical resonance takes place because of the presence of the resonance microwave field. The joint influence of these effects on the formation of a narrow magneto-optical resonance in light wave absorption has been studied theoretically and experimentally. It has been shown analytically that the effects compete with each other and destructively act on the resonance formation. As a result, the amplitude of the resonance is small and its shape is complicated. However, in the presence of a buffer gas the pressure of which is such that the hyperfine splitting of the ground state remains spectrally unresolved, it becomes possible to observe a magneto-optical resonance with a relatively large amplitude. Experiments have been carried out with the use of a miniature glass cell (V~ 0.1 cm3) filled with87Rb vapor and a buffer gas argon (a pressure of about 95 Torr). In particular, the theoretically predicted resonance narrowing with increasing light field intensity has been experimentally observed. A configuration for magneto-optical resonance excitation suggested here may be applied in quantum magnetometry to measure weak permanent magnetic fields and resonance microwave fields using cells filled with alkali metal vapor.
Abstract The absorption of a light wave interacting with optical transitions in the D1 line of an alkali metal atom subjected to microwave radiation that is in resonance with magnetic dipole transitions between hyperfine ground-state components, has been investigated. It is known that when scanning a longitudinal magnetic field (B || k, where k is the wavevector), one may observe a magneto-optical resonance due to the ground-state Hanle effect. In addition, the effect of double radio-optical resonance takes place because of the presence of the resonance microwave field. The joint influence of these effects on the formation of a narrow magneto-optical resonance in light wave absorption has been studied theoretically and experimentally. It has been shown analytically that the effects compete with each other and destructively act on the resonance formation. As a result, the amplitude of the resonance is small and its shape is complicated. However, in the presence of a buffer gas the pressure of which is such that the hyperfine splitting of the ground state remains spectrally unresolved, it becomes possible to observe a magneto-optical resonance with a relatively large amplitude. Experiments have been carried out with the use of a miniature glass cell (V ~ 0.1 cm3) filled with 87Rb vapor and a buffer gas argon (a pressure of about 95 Torr). In particular, the theoretically predicted resonance narrowing with increasing light field intensity has been experimentally observed. A configuration for magneto-optical resonance excitation suggested here may be applied in quantum magnetometry to measure weak permanent magnetic fields and resonance microwave fields using cells filled with alkali metal vapor.
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.
In a weak magnetic field coherent dark resonances in cesium vapor are split into up to 15 resolved components, depending on field direction and laser polarizations. We find that the selection rules are different for vapor cells with and without buffer gas due to a change in multipolarity of the two-photon coupling. At low laser intensities or sufficiently high buffer-gas pressure optical pumping between different dark resonances can be neglected so that a simple model allows one to calculate the relative line strengths, giving complete agreement with the experimental spectra.