Journal de Physique II

Adiabatic transfer in j ↦j and j ↦j - 1 transitions

Constance Valentin, Jin Yu, P. Pillet

Published Nov 1, 1994• 11 citations

Abstract

Coherent transfer in multilevel systems by adiabatic passage through a trapped state has experimentally shown very different efficiencies for the two hyperfine components F = 4 ↦F' = 4 and F = 4 ↦F' = 3 of the cesium D2 line. If an efficiency up to 55 % is observed for mF = 4 ↦mF =- 4 population transfer with the F = 4 ↦F' = 4 component, it is never better than 25 % for the F = 4 ↦F' = 3 one. We report here a theoretical interpretation of these experimental results. We show in particular that the F = 4 ↦F' = 3 transition is much more sensitive to any diffused light, which can destroy totally the trapped state.

DOI: 10.1051/jp2:1994240

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Journal de Physique II

Adiabatic transfer in j ↦j and j ↦j - 1 transitions

Constance Valentin, Jin Yu, P. Pillet

Published Nov 1, 1994• 11 citations

Publisher

Abstract

DOI: 10.1051/jp2:1994240

Related papers

Adiabatic population transfer in a multilevel system

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We report an experimental observation of coherent population transfer in a multilevel system by adiabatic following through a trapped state. Raman transitions between ground-state sublevels are induced by two partially overlapping ${\mathrm{\ensuremath{\sigma}}}^{\ifmmode\pm\else\textpm\fi{}}$ polarized laser beams, tuned to the hyperfine transition F=4\ensuremath{\rightarrow}F'=4 of the cesium ${\mathit{D}}_{2}$ 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.We report an experimental observation of coherent population transfer in a multilevel system by adiabatic following through a trapped state. Raman transitions between ground-state sublevels are induced by two partially overlapping ${\mathrm{\ensuremath{\sigma}}}^{\ifmmode\pm\else\textpm\fi{}}$ polarized laser beams, tuned to the hyperfine transition F=4\ensuremath{\rightarrow}F'=4 of the cesium ${\mathit{D}}_{2}$ 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.

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{\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.

We report the experimental realization of coherent population transfer from the

2{}^{3}S

state to

2{}^{3}P

fine-structure levels of helium, using the technique of hyper-Raman adiabatic passage, in which the pump-laser coupling involves a two-photon transition. We discuss the dependence of population transfer upon pump and Stokes detunings, and show that by suitably setting the detunings one can transfer population efficiently as either a two-step process to final states or as a single-step two-photon transition to an intermediate state. We use an adiabatic-state picture to interpret these experimental results. Since the optimum detuning depends on the pump laser intensity the transfer efficiency is compromised by the variation of the intensity across the spatial profile of the laser beam. Our experimental data agree well with numerical simulation based on density-matrix equations, including all 15 magnetic sublevels.

In this paper, we investigate the coherent control over a complex multilevel atomic system using the stimulated Raman adiabatic passage. Based on the example of

^{87}\mathrm{Rb}

atoms, excited with circularly polarized light at the

{D}_{1}

line, we demonstrate the ability to decompose the system into three- and four-level subsystems independently interacting with light beams. Focusing on the four-level system, we demonstrate that the presence of an additional excited state significantly affects the dynamics of the system evolution. Specifically, it is shown that, through the appropriate tuning of the light beams, some of the transfer channels can be blocked, which leads to better control over the system. We also demonstrate that this effect is most significant in media free from inhomogeneous broadening (e.g., Doppler effect) and deteriorates if such broadening is present. For instance, the motion of atoms affects both the efficiency and selectivity of the transfer.