An Atom Interferometer as a Thermometer
Atom interferometers provide a unique way in which to study atomic de Broglie waves1} and properties of atomic sources. One such property of the atomic ensemble, the temperature, is associated with the coherence length, which can be measured with an interferometer. This can be used to deduce the temperature even at very low temperatures where time of flight methods fail.
KeywordsCoherence Length Matter Wave Atomic Ensemble Spatial Displacement Fringe Visibility
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- 1.For an overview of the subject see Atom Interferometry, edited by P. Berman, (Academic Press, San Diego, 1997).Google Scholar
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- 6.This process is what is meant by the term AT for the remainder of this article.Google Scholar
- 7.This is a valid approximation as long as the AT causes no velocity selection. A model of the π — σ+ — π AT we have developed indicates that velocity selection for a 3 μK sample of atoms is only significant when the pulse length is greater than approximately 20μS. We have also confirmed this experimentally and these results will be presented in a forthcoming paper.Google Scholar