| Frequency Ratio of Two Optical Clock Transitions in and Constraints on the Time Variation of Fundamental Constants RM Godun, PBR Nisbet-Jones, JM Jones, SA King, LAM Johnson, ... Physical review letters 113 (21), 210801, 2014 | 543 | 2014 |
| Hertz-level measurement of the optical clock frequency in a single 88Sr+ ion HS Margolis, GP Barwood, G Huang, HA Klein, SN Lea, K Szymaniec, ... Science 306 (5700), 1355-1358, 2004 | 459 | 2004 |
| A cesium fountain frequency standard: preliminary results A Clairon, P Laurent, G Santarelli, S Ghezali, SN Lea, M Bahoura IEEE Transactions on instrumentation and measurement 44 (2), 128-131, 1995 | 277 | 1995 |
| Heterodyne optical phase-locking of extended-cavity semiconductor lasers at 9 GHz G Santarelli, A Clairon, SN Lea, GM Tino Optics communications 104 (4-6), 339-344, 1994 | 179 | 1994 |
| An experimental study of the spin-exchange frequency shift in a laser-cooled cesium fountain frequency standard S Ghezali, P Laurent, SN Lea, A Clairon Europhysics Letters 36 (1), 25, 1996 | 168 | 1996 |
| High-resolution microwave frequency transfer over an 86-km-long optical fiber network using a mode-locked laser G Marra, R Slavík, HS Margolis, SN Lea, P Petropoulos, DJ Richardson, ... Optics letters 36 (4), 511-513, 2011 | 129 | 2011 |
| Limits to time variation of fundamental constants from comparisons of atomic frequency standards SN Lea Reports on Progress in Physics 70 (9), 1473, 2007 | 124 | 2007 |
| Absolute frequency measurement of the 674-nm 88 Sr+ clock transition using a femtosecond optical frequency comb HS Margolis, G Huang, GP Barwood, SN Lea, HA Klein, WRC Rowley, ... Physical Review A 67 (3), 032501, 2003 | 108 | 2003 |
| Preliminary accuracy evaluation of a cesium fountain frequency standard A Clairon, S Ghezali, G Santarelli, P Laurent, SN Lea, M Bahoura, ... Proc. 5th Symp. Frequency Standards and Metrology, 49-59, 1996 | 96 | 1996 |
| Evaluation of the primary frequency standard NPL-CsF1 K Szymaniec, W Chalupczak, PB Whibberley, SN Lea, D Henderson Metrologia 42 (1), 49, 2005 | 93 | 2005 |
| High-stability microwave frequency transfer by propagation of an optical frequency comb over 50 km of optical fiber G Marra, HS Margolis, SN Lea, P Gill Optics letters 35 (7), 1025-1027, 2010 | 76 | 2010 |
| Subkilohertz absolute-frequency measurement of the 467-nm electric octupole transition in 171 Yb+ PJ Blythe, SA Webster, HS Margolis, SN Lea, G Huang, SK Choi, ... Physical Review A 67 (2), 020501, 2003 | 73* | 2003 |
| Trapped ion optical frequency standards P Gill, GP Barwood, HA Klein, G Huang, SA Webster, PJ Blythe, K Hosaka, ... Measurement Science and Technology 14 (8), 1174, 2003 | 69 | 2003 |
| High-accuracy frequency atlas of 13C2H2 in the 1.5 μm region CS Edwards, HS Margolis, GP Barwood, SN Lea, P Gill, WRC Rowley Applied Physics B 80, 977-983, 2005 | 67 | 2005 |
| An optical frequency standard based on the electric octupole transition in/sup 171/Yb/sup+ K Hosaka, SA Webster, PJ Blythe, A Stannard, D Beaton, HS Margolis, ... IEEE transactions on instrumentation and measurement 54 (2), 759-762, 2005 | 64 | 2005 |
| Absolute frequency measurement of a 1.5-µm acetylene standard by use of a combined frequency chain and femtosecond comb CS Edwards, HS Margolis, GP Barwood, SN Lea, P Gill, G Huang, ... Optics letters 29 (6), 566-568, 2004 | 59 | 2004 |
| Absolute frequency measurements of 633 nm iodine-stabilized helium–neon lasers SN Lea, WRC Rowley, HS Margolis, GP Barwood, G Huang, P Gill, ... Metrologia 40 (2), 84, 2003 | 45 | 2003 |
| Laser cooling and trapping of atoms: new tools for ultra-stable caesium clocks SN Lea, A Clairon, C Salomon, P Laurent, B Lounis, J Reichel, A Nadir, ... Physica Scripta 1994 (T51), 78, 1994 | 32 | 1994 |
| NPL Cs fountain frequency standards and the quest for the ultimate accuracy K Szymaniec, SN Lea, K Gibble, SE Park, K Liu, P Głowacki Journal of Physics: Conference Series 723 (1), 012003, 2016 | 31 | 2016 |
| Optical atomic clocks for space P Gill, H Margolis, A Curtis, H Klein, S Lea, S Webster, P Whibberley National Physical Laboratory, 145, 2008 | 28 | 2008 |
