Light shift of the Ramsey resonance of coherent population trapping in optically dense medium

Баранцев, К. А.; Волошин, Г. В.; Литвинов, А. Н.; Попов, Е. Н.

doi:10.1051/epjconf/201819004003

Cited by 1 publication

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“…Light shift in RamanRamsey resonances has been the subject of several recent works [50,51] and has been also studied in a cold-atom clock [52][53][54]. In this subsection, we are interested to assess light-shift in an optically thick hot vapor.…”

Section: Light-shift In An Optically Thick Vapormentioning

confidence: 99%

Raman-Ramsey resonances in atomic vapor cells: Rabi pulling and optical-density effects

Micalizio

Godone

2019

Phys. Rev. A

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Raman-Ramsey interference has proved as a very effective technique to implement compact and high performing vapor cell frequency standards. In this paper, we theoretically characterize Raman-Ramsey resonances in an optically thick atomic vapor. Specifically, some parameters of interest for frequency standards applications, like contrast and linewidth of the central Raman-Ramsey fringe, are evaluated at different temperatures for 133 Cs and 87 Rb vapor cells with buffer gas. Density narrowing and broadening effects are described and explained in terms of a three-level theory where laser fields propagation through the atomic medium is taken into account. Also, we investigate light-shift both in low and high atomic density regimes. Light-shift, which potentially degrades the medium-long term stability of Raman-Ramsey clocks, is composed of two contributions. The first is a pulling effect exerted by the wide Rabi profile enclosing the interference pattern on the central Raman-Ramsey fringe. The second light-shift term is strictly related to the detection time.Calculations derived from our model well describe already existing experimental results and new behaviors are predicted.

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