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Nondestructive spatial heterodyne imaging of cold atoms

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Abstract

We demonstrate a new method for nondestructive imaging of laser-cooled atoms. This spatial heterodyne technique forms a phase image by interfering a strong reference laser beam with a weak probe beam that passes through the cold atom cloud. The figure of merit equals or exceeds that of phase-contrast imaging, and the technique can be used over a wider range of spatial scales. We show images of a dark-spot magneto-optic trap taken with imaging fluences as low as 61 pJ/cm2 at a detuning of 11 Γ, resulting in 0.0004 photons scattered per atom.

© 2001 Optical Society of America

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