L. A. M. Johnson

International timescales with optical clocks (ITOC)

D. Piester, D. Calonico, J. Achkar, 2013, 2013 Joint European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFC).

Agreement between two 88 Sr + optical clocks to 4 parts in 10 17

Patrick Gill, Geoffrey P. Barwood, K. Szymaniec, 2014 .

Evaluating the performance of the NPL femtosecond frequency combs: agreement at the 10−21 level

P. Gill, H. Margolis, L. A. M. Johnson, 2014, 1408.2387.

Absolute frequency measurement of the 2S1/2–2F7/2 electric octupole transition in a single ion of 171Yb+ with 10−15 fractional uncertainty

P. Gill, H. Margolis, K. Szymaniec, 2012 .

Transportable cavity-stabilized laser system for optical carrier frequency transmission experiments.

P. Bayvel, S. Lea, P. Gill, 2014, Applied optics.

Absolute frequency measurements of 85RbnF7/2 Rydberg states using purely optical detection

B. Varcoe, T. Becker, B. Sanguinetti, 2010, 1002.3066.

Time Trials for Fundamental Constants

P. Gill, K. Bongs, E. Peik, 2014 .

Frequency ratio of two optical clock transitions in 171Yb+ and constraints on the time variation of fundamental constants.

P Gill, S. Lea, P. Gill, 2014, Physical review letters.

Precision laser spectroscopy of rubidium with a frequency comb

L. A. M. Johnson, 2011 .