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A high-resolution Ramsey-Bordé spectrometer for optical clocks based on cold Mg atoms

  • J. Keupp
  • A. Douillet
  • T. E. Mehlstäubler
  • N. Rehbein
  • E. M. RaselEmail author
  • W. Ertmer
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Abstract.

We report on recent progress in our Ramsey-Bordé interferometer with cold magnesium atoms at 457.2 nm. A resolution as high as \(\Delta \nu = 290\ \mbox{Hz}\) was achieved, which corresponds to a quality factor of Q = 2.3×1012. An upper limit of 170 Hz for the laser oscillator line width is inferred from the interferometric analysis of the contrast decay induced by the residual atomic motion and spontaneous emission. The performance of the spectrometer allows to realize an optical frequency standard at 457.2 nm with a short-term stability of up to \(\sigma_y (\tau=1\,\mbox{s})= 8 \times 10^{-14}\) with 105 atoms similar to state-of-the art, non-cryogenic microwave clocks or oscillators.

Keywords

Neural Network Magnesium Microwave Quality Factor Line Width 
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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  • J. Keupp
    • 1
  • A. Douillet
    • 1
  • T. E. Mehlstäubler
    • 1
  • N. Rehbein
    • 1
  • E. M. Rasel
    • 1
    Email author
  • W. Ertmer
    • 1
  1. 1.Institute for Quantum Optics, University of HannoverHannoverGermany

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