Absorption imaging of ultracold atoms on atom chips.

  title={Absorption imaging of ultracold atoms on atom chips.},
  author={David Adu Smith and Simon Aigner and Sebastian Hofferberth and Michael P. Gring and Mauritz Andersson and S. Wildermuth and Peter Kr{\"u}ger and Stephan Schneider and Thorsten Schumm and J{\"o}rg Schmiedmayer},
  journal={Optics express},
  volume={19 9},
Imaging ultracold atomic gases close to surfaces is an important tool for the detailed analysis of experiments carried out using atom chips. We describe the critical factors that need be considered, especially when the imaging beam is purposely reflected from the surface. In particular we present methods to measure the atom-surface distance, which is a prerequisite for magnetic field imaging and studies of atom surface-interactions. 

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