467 citations · 505 across the 2 of their papers we have counts for
3 papers
Evaluating the performance of the NPL femtosecond frequency combs: Agreement at the level
L. A. M. Johnson, P. Gill, H. S. Margolis
Results are presented from a series of comparisons between two independent femtosecond frequency comb systems at NPL, which were carried out in order to assess their systematic unc…
Frequency ratio of two optical clock transitions in Yb and constraints on the time-variation of fundamental constants
R. M. Godun, P. B. R. Nisbet-Jones, J. M. Jones +7
Singly-ionized ytterbium, with ultra-narrow optical clock transitions at 467 nm and 436 nm, is a convenient system for the realization of optical atomic clocks and tests of present…
Absolute frequency measurements of 85Rb nF7/2 Rydberg states using purely optical detection
L. A. M. Johnson, H. O. Majeed, B. Sanguinetti +2
A three-step laser excitation scheme is used to make absolute frequency measurements of highly excited nF7/2 Rydberg states in 85Rb for principal quantum numbers n=33-100. This wor…