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Laser Physics

Rydberg-state species in a strong laser field

Edward A. Manykin

Published Jan 1, 2003• 0 citations
OpenAlex

Abstract

A brief state-of-art review of the research into the interaction of laser radiation with Rydberg atoms and clusters of Rydberg atoms is provided. The dynamics of various Rydberg species in a high-frequency optical field is described with the use of the quantum-mechanical approach. Experimental data indicating the existence of Rydberg-state species (Rydberg clusters and Rydberg matter) are analyzed. A special emphasis is placed on Raman processes in Rydberg atoms and Rydberg matter created on solid surfaces.

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Journal of Experimental and Theoretical Physics Letters•May 1, 2011•0 citations
A brief state-of-art review of the research into the interaction of laser radiation with Rydberg atoms and clusters of Rydberg atoms is provided. The dynamics of various Rydberg species in a high-frequency optical field is described with the use of the quantum-mechanical approach. Experimental data indicating the existence of Rydberg-state species (Rydberg clusters and Rydberg matter) are analyzed. A special emphasis is placed on Raman processes in Rydberg atoms and Rydberg matter created on solid surfaces.
The interaction between Rydberg systems [Rydberg atoms (RA) gas or Rydberg matter (RM)] and coherent light in various frequency bands is considered. It is shown why Rydberg systems possess a greater polarizabilities and, accordingly, linear and nonlinear susceptibilities and strong sensitive to high-1 (circular) Rydberg states in RA and RM. Quantum theory of physical and chemical properties of RA and RM are related with recent obtained results on the optical spectroscopy. The experimental data of Raman processes, wave mixing effects in gas of RA, and their clusters of RM are analyzed. Problem of blueshifts and stimulated electronic laser Raman processes, as well as four wave mixing in RM are discussed.
Since the discovery of the Rydberg atom in 1885, research on the Rydberg atom has presented numerous discoveries about the Rydberg atom. As the atoms has valence electron in a high principal quantum number state, Rydberg atoms can interact with each other in a unique way, such as dipole-dipole interactions, Rydberg blockade and anti-blockade. To reach the Rydberg state, it is usually necessary to use a laser to excite the atoms from their ground state. Due to the special characteristics about Rydberg atoms as well as their interactions, it has demonstrated promising of application in different fields, for example, quantum computing and quantum information, as well as nonlinear optics and photonics. However, due to the technical limitations, the demand of deterministic atoms sources and the effect of blackbody radiation are still hindering the research relative to Rydberg atoms. For future study relative to Rydberg atoms, the additions with laser-trapping could be beneficial for fields like quantum electro dynamics and localized electromagnetic field probing.
We review experimental and theoretical tools to excite, study and understand strongly interacting Rydberg gases. The focus lies on the excitation of dense ultracold atomic samples close to, or within quantum degeneracy, high-lying Rydberg states. The major part is dedicated to highly excited S-states of rubidium, which feature an isotropic van der Waals potential. Nevertheless, the setup and the methods presented are also applicable to other atomic species used in the field of laser cooling and atom trapping.
The ionization dynamics of two interacting Rydberg atoms in a strong laser field has been investigated. Each atom has been described in the “two discrete levels + continuum” model. Quasienergy states in this system, which describe field-dressed atoms, have been studied. It has been shown that one of the quasienergy states corresponds to the formation of an atomic state stable against ionization, which leads to the interference stabilization regime first observed in the case of individual atoms in [M. V. Fedorov and A. M. Movsesian, J. Phys. B 21 , L155 (1988)]. Methods for creating entangled states in this system have been proposed and the dynamics of entanglement in the process of interaction with the laser field has been analyzed.