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A Ca optical frequency standard: Frequency stabilization by means of nonlinear Ramsey resonances

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Abstract

An optical frequency standard based on frequency stabilization to Ramsey fringes observed in a Ca atomic beam is described. The important operation parameters influencing the uncertainty of such a standard are studied experimentally. Frequency shifts due to phase errors of separated traveling wave excitation can be strongly reduced by means of laser beam reversal. It is expected that the present fractional uncertainty of approximately 2.3×10−12 to realize the true line center can be reduced below the 10−14 level by applying atomic beam cooling and improved phase alignment.

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Author notes

  1. A. Morinaga (Guest sientists) & J. Ishikawa

    Present address: National Research Laboratory of Metrology, 1-4 Umezono, 1-Chome, 305, Tsukuba-Shi, Japan

Authors and Affiliations

  1. Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-3300, Braunschweig, Fed. Rep. Germany

    A. Morinaga (Guest sientists), F. Riehle, J. Ishikawa & J. Helmcke

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  1. A. Morinaga
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  2. F. Riehle
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  3. J. Ishikawa
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  4. J. Helmcke
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Morinaga, A., Riehle, F., Ishikawa, J. et al. A Ca optical frequency standard: Frequency stabilization by means of nonlinear Ramsey resonances. Appl. Phys. B 48, 165–171 (1989). https://doi.org/10.1007/BF00692142

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  • DOI: https://doi.org/10.1007/BF00692142

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