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Review of Scientific Instruments / Volume 79 / Issue 1 / OPTICS; ATOMS AND MOLECULES; SPECTROSCOPY; PHOTON DETECTORS

Rev. Sci. Instrum. 79, 013101 (2008); http://dx.doi.org/10.1063/1.2827517 (4 pages)

Measurement of temperature of laser cooled atoms by one-dimensional expansion in a magneto-optical trap

S. Pradhan and B. N. Jagatap

Atomic Physics & Quantum Optics Section, Laser & Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 400 085, India

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(Received 6 August 2007; accepted 3 December 2007; published online 2 January 2008)

We discuss a simple time of flight technique for measurement of temperature of a cold cloud in a magneto-optical trap (MOT). The technique is based on spatiotemporal fluorescence imaging of the cloud that is allowed to undergo one-dimensional expansion in the presence of the orthogonal two-dimensional configuration of laser beams by temporal modulation of a pair of counterpropagating trapping beams in the MOT. We show that, in the time scale 0 ⩽ t<5 ms, the expansion of the cloud is ballistic and the temperature can be extracted from the time variation of the rms size of the cloud in the expansion direction. The reliability of the technique has been established by comparing the results with release and recapture method, and also by fitting them to the known temperature scaling law.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL SCHEME
  3. RESULTS AND DISCUSSION
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

atom-photon collisions, fluorescence, magneto-optical effects, radiation pressure, time of flight spectra

PACS

  • 37.10.Gh

    Atom traps and guides

  • 32.60.+i

    Zeeman and Stark effects

  • 32.50.+d

    Fluorescence, phosphorescence (including quenching)

  • 32.80.-t

    Photoionization and excitation

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2827517

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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