High contrast dark resonances in a cold-atom clock probed with counterpropagating circularly polarized beams

X. Liu, V. I. Yudin, A. V. Taichenachev, J. Kitching, E. A. Donley

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

A cold-atom coherent population trapping clock based on σ+-σ- interrogation realized by counter-propagating optical fields of opposite circular polarization is presented. The simultaneous use of σ+ and σ- polarizations prevents atoms from being trapped in the end magnetic sublevels, significantly enhancing the contrast over interrogation with a single circular polarization. Because the system is based on cold atoms and there is very little relaxation, nearly complete dark states are created, and coherent population trapping resonances with maximum contrast are observed. A frequency stability of 1.3×10-11/√τ is achieved, which averages down to 2×10-13 after a 40 000 s integration period.

Original languageEnglish
Article number224102
Number of pages5
JournalApplied Physics Letters
Volume111
Issue number22
DOIs
Publication statusPublished - 27 Nov 2017

Keywords

  • POPULATION
  • STABILITY
  • LINE

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