Spatial calibration of high-density absorption imaging
J. Phys. B: At. Mol. Opt. Phys. 57, 145301 (2024) 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 negle...
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| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
09-02-2024
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | J. Phys. B: At. Mol. Opt. Phys. 57, 145301 (2024) 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 $\approx\! 12\,\%$ and temperature up to $\approx \!14\,\%$ 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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| DOI: | 10.48550/arxiv.2402.06514 |