Atom number calibration in absorption imaging at very small atom numbers

Konstantinidis, Gregory O., Pappa, Melina, Wikstroem, Gustav, Condylis, Paul C., Sahagun, Daniel, Baker, Mark, Morizot, Olivier and von Klitzing, Wolf (2012) Atom number calibration in absorption imaging at very small atom numbers. Central European Journal of Physics, 10 5: 1054-1058. doi:10.2478/s11534-012-0108-x

Author Konstantinidis, Gregory O.
Pappa, Melina
Wikstroem, Gustav
Condylis, Paul C.
Sahagun, Daniel
Baker, Mark
Morizot, Olivier
von Klitzing, Wolf
Title Atom number calibration in absorption imaging at very small atom numbers
Journal name Central European Journal of Physics   Check publisher's open access policy
ISSN 1895-1082
Publication date 2012-10
Sub-type Article (original research)
DOI 10.2478/s11534-012-0108-x
Open Access Status DOI
Volume 10
Issue 5
Start page 1054
End page 1058
Total pages 5
Place of publication Warsaw, Poland
Publisher Versita
Collection year 2013
Language eng
Formatted abstract
Cold atom experiments often use images of the atom clouds as their exclusive source of experimental information. The most commonly used technique is absorption imaging, which provides accurate information about the shapes of the atom clouds, but requires care when seeking the absolute atom number for small atom samples. In this paper, we present an independent, absolute calibration of the atom numbers. We directly compare the atom number detected using dark-ground imaging to the one observed by fluorescence imaging of the same atoms in a magneto-optical trap. We normalise the signal using single-atom resolved fluorescence imaging. In order to be able to image the absorption of the very low atom numbers involved, we use diffractive dark-ground imaging as a novel, ultra-sensitive method of in situ imaging for untrapped atom clouds down to only 100 atoms. We demonstrate that the Doppler shift due to the acceleration of the atoms by the probe beam has to be taken into account when measuring the atom-number.
Keyword Ultra cold atoms
Magneto optic trap
Dark ground imaging
Absorption imaging
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2013 Collection
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