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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2402.06514 |
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| _version_ | 1866914898411257856 |
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| author | Vibel, Toke Christensen, Mikkel Berg Kristensen, Mick Althoff Thuesen, Jeppe Juhl Stokholm, Laurits Nikolaj Weidner, Carrie Ann Arlt, Jan Joachim |
| author_facet | Vibel, Toke Christensen, Mikkel Berg Kristensen, Mick Althoff Thuesen, Jeppe Juhl Stokholm, Laurits Nikolaj Weidner, Carrie Ann Arlt, Jan Joachim |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_06514 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spatial calibration of high-density absorption imaging Vibel, Toke Christensen, Mikkel Berg Kristensen, Mick Althoff Thuesen, Jeppe Juhl Stokholm, Laurits Nikolaj Weidner, Carrie Ann Arlt, Jan Joachim Atomic Physics Quantum Gases 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. |
| title | Spatial calibration of high-density absorption imaging |
| topic | Atomic Physics Quantum Gases |
| url | https://arxiv.org/abs/2402.06514 |