arXiv:0908.2389 · Physical Review A

Stimulated Raman transitions via multiple atomic levels

James Bateman, André Xuereb, Tim Freegarde

Published Apr 12, 2010• 20 citations

Abstract

We consider the stimulated Raman transition between two long-lived states via multiple intermediate states, such as between hyperfine ground states in the alkali-metal atoms. We present a concise treatment of the general, multilevel, off-resonant case, and we show how the lightshift emerges naturally in this approach. We illustrate our results by application to alkali-metal atoms and we make specific reference to cesium. We comment on some artifacts, due solely to the geometrical overlap of states, which are relevant to existing experiments.

DOI: 10.1103/physreva.81.043808

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arXiv:0908.2389 · Physical Review A

Stimulated Raman transitions via multiple atomic levels

James Bateman, André Xuereb, Tim Freegarde

Published Apr 12, 2010• 20 citations

arXiv HTML PDF

Abstract

DOI: 10.1103/physreva.81.043808

Related papers

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We present a general formalism for describing stimulated Raman adiabatic passage in a multilevel atom. The atom is assumed to have two ground state manifolds

a

and

b

and an excited state manifold

e

, and the adiabatic passage is carried out by resonantly driving the $a\text{\ensuremath{-}}e$ and $b\text{\ensuremath{-}}e$ transitions with time-dependent fields. Our formalism gives a complete description of the adiabatic passage process and can be applied to systems with arbitrary numbers of degenerate states in each manifold and arbitrary couplings of the $a\text{\ensuremath{-}}e$ and $b\text{\ensuremath{-}}e$ transitions. We illustrate the formalism by applying it to both a simple toy model and to adiabatic passage in the cesium atom.

{\mathit{D}}_{2}

line. An efficiency of more than 50% is observed for the

{\mathit{m}}_{\mathit{F}}

=+4\ensuremath{\rightarrow}

{\mathit{m}}_{\mathit{F}}

=-4 population transfer. The influence of other excited hyperfine levels on the transfer efficiency is pointed out. The feasibility of the technique with counterpropagating laser beams is also demonstrated.

{D}_{1}

optical transition, we show important deviations from the predictions of the usual three-level $\ensuremath{\Lambda}$-scheme approximation and we demonstrate an enhancement of the process for particular detunings of the control. We estimate the memory efficiency one can obtain using this configuration.