Quantitative absorption imaging: The role of incoherent multiple scattering in the saturating regime

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

doi:10.1103/physrevresearch.4.033033

Cited by 2 publications

(9 citation statements)

References 31 publications

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“…Therefore, we conclude that many body scattering processes must be included for an accurate representation of the dynamics involved. This is corroborated by [3], which explores, theoretically and experimentally, the effect of incoherent many-body scattering and shows a similar linear dependence to the one used in equation ( 8).…”

Section: Density Dependencesupporting

confidence: 64%

“…The aspect ratio of the cloud is taken into account by averaging elliptical ROIs with a width of 10 pixels, where the major and minor axes of the ellipses are proportional to the cloud widths in both directions. These cloud widths are determined by a Gaussian fit to the cloud od given by equation (3) with α * = 1. Figure 1 shows the optical density of a single, typical experimental image of a thermal atom cloud with its Gaussian density profile and these elliptical ROIs.…”

Section: Spatially Dependent α * -Calibrationmentioning

confidence: 99%

“…Fluorescence methods, which rely on direct capture of these scattered photons, have been used ubiquitously in atomic physics. Absorption imaging is a workhorse in the field of ultracold atomic physics, including the investigation of Bose-Einstein condensation [1], but its accurate calibration remains difficult [2,3]. Other variations on absorption imaging exist, including resonant frequency modulation imaging [4], which has been shown to produce images with high signal-to-noise ratio (SNR) [5].…”

Section: Introductionmentioning

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%

“…Rather, the atom number fluctuations common to non-stabilized experiments will simply lead to larger uncertainties in the calibrated values. Note that the experiments presented here are related to recent in-situ measurements [3]; however, [3] does not provide an analysis for the commonly used time-of-flight (ToF) imaging technique.…”

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: Density Dependencesupporting

confidence: 64%

Section: Spatially Dependent α * -Calibrationmentioning

confidence: 99%