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Journal of Applied Spectroscopy

Light-Induced shifts in the frequency of a multiphoton radiooptical SHF resonance in alkali atoms

V. V. Semenov

Published Nov 1, 1998• 0 citations
Publisher
DOI
10.1007/bf02675742

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This paper presents the results of investigation Stark shift effect influence on the long-term stability of a dual scheme of quantum magnetometers. Such scheme allows suppressing Stark shift components when a certain pumping light polarization is applied. As a result, long-term stability of a quantum sensor increases. However, when low-frequency (LF) and microwave fields are attached to a single vapor cell a coherence circulation in hyperfine structure of alkali atoms takes place. Physical origin of this effect is associated with the so called "dressed" atom theory, when atom is "dressed" by LF field. It yields in multiphoton absorption and resonance frequency shift. First estimates for this shift based on density matrix evolution formalism are provided in the paper.
It is shown that the coherence created by a resonance transverse superhigh-frequency (SHF) field induces, under the action of a longitudinal SHF and transverse radio-frequency (RF) nonresonance fields, the Zeeman coherences on two adjacent allowed Δ m = 1 transitions. Under the action of an RF transverse field these coherences induce further a coherence on a forbidden Δ m = 2 transition. The resonance behavior of such coherence was earlier observed experimentally when the RF-field frequency coincided with the Δ m = 2 transition frequency. The theoretical conclusions are in quantitative agreement with the experiment.