Applied physics

, Volume 24, Issue 2, pp 107–112 | Cite as

Frequency stability of a mercury ion frequency standard

  • M. Jardino
  • M. Desaintfuscien
  • R. Barillet
  • J. Viennet
  • P. Petit
  • C. Audoin
Photophysics, Laser Chemistry

Abstract

Observation with an improved signal-to-noise ratio of the hyperfine resonance pattern of199Hg+ stored in a radiofrequency trap is reported. A frequency control loop which locks the frequency of a 5MHz quartz crystal oscillator to the hyperfine transition of stored mercury ions, close to 40.5 GHz, is described. In this system, pulses delivered by the photomultiplier are processed digitally. Optimal conditions for the interrogation of the hyperfine transition are specified. A fractional frequency stability σy(τ)=3.6×10−11τ−1/2 for 10s<τ<3500s has been obtained. This frequency stability is comparble to that of commercially available cesium beam frequency standards. Prospect for improvement by a factor of at least 10 are discussed.

PACS

06.30 F 32 35 52-55 

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Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • M. Jardino
    • 1
  • M. Desaintfuscien
    • 1
  • R. Barillet
    • 1
  • J. Viennet
    • 1
  • P. Petit
    • 1
  • C. Audoin
    • 1
  1. 1.Laboratoire de l'Horloge AtomiqueEquipe de Recherche du CNRS associée à l'Université Paris-SudOrsayFrance

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