Effective two-level approximation of a multilevel system driven by coherent and incoherent fields

Veyron, Romain; Mancois, Vincent; Gerent, Jean-Baptiste; Baclet, Guillaume; Bouyer, Philippe; Bernon, Simon

doi:10.1103/physreva.105.043105

Cited by 2 publications

(4 citation statements)

References 26 publications

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“…Our work shows the need for further theoretical developments to understand the scattering processes in ultracold dense clouds of atoms [25]. A more detailed understanding may explain the differences between the results reported here and those presented in [3] for in-situ measurements.…”

Section: Discussionmentioning

confidence: 54%

“…Our calibration method is local since it assigns a calibration coefficient α * for each optical density. The analysis shows a significant dependence of the calibration coefficient α * on the optical density which we attribute to the many-body scattering processes and the re-absorption of photons [3,25]. The calibration coefficient can readily be obtained from absorption images, and we provide a practical guide to the calibration process.…”

Section: Discussionmentioning

confidence: 92%

“…Moreover, the data points deviate from a linear dependence for the highest optical densities. While our analysis captures the general density dependence, a microscopic description of the imaging process is required to explain the nonlinear behavior [25].…”

Section: Density Dependencementioning

confidence: 99%

“…Additionally, the probing light imparts momentum to the atoms, which can lead to an effective detuning for typical probing durations. At higher densities, additional effects such as re-absorption processes and coherent many-body scattering come into play [3,25]. One must also correct for the effect of an imperfect probe pulse shape [26].…”

Section: Introductionmentioning

confidence: 99%

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Spatial calibration of high-density absorption imaging

Vibel,

Christensen,

Kristensen

et al. 2024

J. Phys. B: At. Mol. Opt. Phys.

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The accurate determination of atom numbers is an ubiquitous problem in the field of ultracold atoms. For modest atom numbers, absolute calibration techniques are available, however, for large numbers and high densities, the available techniques neglect many-body scattering processes. Here, a spatial calibration technique for time-of-flight absorption images of ultracold atomic clouds is presented. The calibration is obtained from radially averaged absorption images and we provide a practical guide to the calibration process. It is shown that the calibration coefficient scales linearly with optical density and depends on the absorbed photon number for the experimental conditions explored here. This allows for the direct inclusion of a spatially dependent calibration in the image analysis. For typical ultracold atom clouds the spatial calibration technique leads to corrections in the detected atom number up to ≈12% and temperature up to ≈14% in comparison to previous calibration techniques. The technique presented here addresses a major difficulty in absorption imaging of ultracold atomic clouds and prompts further theoretical work to understand the scattering processes in ultracold dense clouds of atoms for accurate atom number calibration.

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Section: Discussionmentioning

confidence: 54%

Section: Discussionmentioning

confidence: 92%

Section: Density Dependencementioning

confidence: 99%