Resolution 8 of the 24th CGPM (2011)

On the revision of the mise en pratique of the metre and the development of new optical frequency standards

The General Conference on Weight and Measures (CGPM), at its 24th meeting,

considering that

  • there have been rapid and important improvements in the performance of optical frequency standards,
  • national metrology institutes are working on comparison techniques for optical frequency standards over short distances,
  • remote comparison techniques need to be developed at an international level so that optical frequency standards can be compared,


  • the activities of the joint working group of the CCTF and the CCL to review the frequencies of optically-based representations of the second,
  • the additions made by the CIPM in 2009 to the common list of "Recommended values of standard frequencies for applications including the practical realization of the metre and secondary representations of the second",
  • the establishment of a CCTF working group on Coordination of the Development of Advanced Time and Frequency Transfer Techniques,

recommends that

  • NMIs commit resources to the development of optical frequency standards and their comparison,
  • the BIPM supports the coordination of an international project with the participation of NMIs, oriented to the study of the techniques which could serve to compare optical frequency standards.

DOI : 10.59161/CGPM2011RES8E

The reader should note that the official version of this Resolution is the French text

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