An international comparison of the optical frequencies of 127 Iodine stabilised He-Ne lasers at 633 nm will be arranged at the BEV. It will be performed using matrix frequency comparison of lasers consequently stabilised to different lines of the R(127) 11-5 transition. Stability will be evaluated using Allan variance (0.1 s to 10000 s). Depending on the number of lasers this work can be finished in about two weeks.
The results of the comparison will be published in Metrologia.