Applied Physics B

, Volume 74, Issue 3, pp 217–222

Temperature dependence of coherent population trapping resonances

  • S. Knappe
  • J. Kitching
  • L. Hollberg
  • R. Wynands
Article
  • 153 Downloads

Abstract

We measure the properties of coherent population trapping (CPT) resonances in Cs vapor cells as a function of temperature. We expected the CPT signal to increase with higher vapor density, but instead the signal fades away above a certain density. Two possible density-dependent explanations are discussed: spin-exchange collisions, which are found to give no relevant contribution at the temperatures considered here, and increased absorption due to the optical thickness of the vapor. The dependence of the dark-line resonance amplitude as a function of cell temperature can be well represented by a simple model based on the optical thickness of the vapor as a function of temperature.

PACS: 42.50.Gy; 32.70.Jz; 32.70.Fw; 32.80.Bx; 42.62.Eh 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • S. Knappe
    • 1
  • J. Kitching
    • 2
  • L. Hollberg
    • 2
  • R. Wynands
    • 1
  1. 1.Institut für Angewandte Physik, Universität Bonn, Wegelerstrasse 8, 53115 Bonn, GermanyDE
  2. 2.National Institute of Standards and Technology, 325 S. Broadway, Boulder, CO 80305-3328, USAUS

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