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Diffraction-contrast imaging of cold atoms

L. D. Turner, K. F. E. M. Domen, and R. E. Scholten
Phys. Rev. A 72, 031403(R) – Published 15 September 2005
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Abstract

We consider the inverse problem of in-line holography, applied to minimally destructive imaging of cold atom clouds. Absorption imaging near resonance provides a simple, but destructive measurement of atom column density. Imaging off resonance greatly reduces heating, and sequential images may be taken. Under the conditions required for off-resonant imaging, the generally intractable inverse problem may be linearized. A minimally destructive, quantitative and high-resolution image of the atom cloud column density is then retrieved from a single diffraction pattern.

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  • Received 1 March 2005

DOI:https://doi.org/10.1103/PhysRevA.72.031403

©2005 American Physical Society

Authors & Affiliations

L. D. Turner*,†, K. F. E. M. Domen‡, and R. E. Scholten

  • School of Physics, University of Melbourne, Victoria 3010, Australia

  • *Present address: National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • †Electronic address: l.turner@aip.org.au
  • ‡Present address: Faculty of Applied Physics, Eindhoven University of Technology, The Netherlands.

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Issue

Vol. 72, Iss. 3 — September 2005

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Images

  • Figure 1
    Figure 1
    Recording a diffraction pattern. Vertical lines represent intensity profiles. In part (b), point-source illumination magnifies the diffraction pattern.Reuse & Permissions
  • Figure 2
    Figure 2
    The contrast transfer function h̃, normalized, for phase-advancing (solid line) and phase-retarding (dashed line) monomorphous objects. At low spatial frequencies the contrast approaches the value for an in-focus absorption image.Reuse & Permissions
  • Figure 3
    Figure 3
    Above, the recorded diffraction pattern. Below, the column density retrieved using Eq. (10), shown at twice the magnification of the diffraction pattern. Plots averaged over the central five rows of pixels are shown below the images. The overplotted gray trace shows the column density calculated from an on-resonance in-focus absorption image.Reuse & Permissions
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