Recommendation 1 of the 14th CCL (2009)

Supporting key comparison CCL-K11 in national metrology laboratories

The Consultative Committee for Length,

considering that

• the key comparison of stabilized lasers has been defined by the CCL as a BIPM key comparison under the name BIPM.L-K11 in 2003,
• the BIPM organized BIPM.L-K11, started the first measurements in 2004, and ran successful comparisons of more than thirty frequency standards until the end of 2006,
• the CIPM recommended to re-organize it as a CCL key comparison under the name CCL-K11 with one pilot laboratory and several node laboratories distributed in the regions;

and aware that

• CCL-K11 has started under the new structure, with one pilot and four other node laboratories,
• these laboratories call for technical expertise from the BIPM,
• the CCL WGDM had recognized this need;

recommends that

• the BIPM provide support to the development of CCL-K11 during a transition period by allowing one of its experts on laser frequency metrology to assist the node laboratories.

DOI : 10.59161/CCL2009REC1E