arXiv:1201.3742 · Physical Review A

Ultranarrow resonance due to coherent population oscillations in a Λ-type atomic system

T. Lauprêtre, Santosh Kumar, Perrine Berger, Raffaele Faoro, Rupamanjari Ghosh, Fabien Bretenaker, Fabienne Goldfarb

Published May 24, 2012• 36 citations

Abstract

It is well known that ultranarrow electromagnetically induced transparency (EIT) resonances can be observed in atomic gases at room temperature. We report here the experimental observation of another type of ultranarrow resonance, as narrow as the EIT ones, in a $\ensuremath{\Lambda}$ system selected by light polarization in metastable ${}^{4}$He at room temperature. It is shown to be due to coherent population oscillations in an open two-level system (TLS). For perpendicular linearly polarized coupling and probe beams, this system can be considered as two coupled open TLSs, in which the ground-state populations exhibit antiphase oscillations. We also predict theoretically that in the case of two parallel polarizations, the system would behave like a closed TLS, and the narrow resonance associated with these oscillations would disappear.

DOI: 10.1103/physreva.85.051805

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arXiv:1201.3742 · Physical Review A

Ultranarrow resonance due to coherent population oscillations in a Λ-type atomic system

T. Lauprêtre, Santosh Kumar, Perrine Berger, Raffaele Faoro, Rupamanjari Ghosh, Fabien Bretenaker, Fabienne Goldfarb

Published May 24, 2012• 36 citations

arXiv HTML PDF

Abstract

\ensuremath{\Lambda}

system selected by light polarization in metastable

{}^{4}

He at room temperature. It is shown to be due to coherent population oscillations in an open two-level system (TLS). For perpendicular linearly polarized coupling and probe beams, this system can be considered as two coupled open TLSs, in which the ground-state populations exhibit antiphase oscillations. We also predict theoretically that in the case of two parallel polarizations, the system would behave like a closed TLS, and the narrow resonance associated with these oscillations would disappear.

DOI: 10.1103/physreva.85.051805

Related papers

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\ensuremath{\Lambda}

system selected by light polarization in metastable

{}^{4}

\Lambda

system selected by polarization in metastable

^4

He, such a light storage is experimentally shown to be phase preserving. As it does not involve any atomic coherences it has the advantage of being robust to dephasing effects such as small magnetic field inhomogeneities. The storage time is limited by the population lifetime of the ground states of the

\Lambda

system.

^{4}\mathrm{He}

, such a light storage is experimentally shown to be phase preserving. As it does not involve any atomic coherences it has the advantage of being robust to dephasing effects such as small magnetic field inhomogeneities. The storage time is limited by the population lifetime of the ground states of the $\ensuremath{\Lambda}$ system.