Space clocks and fundamental tests: The ACES experiment

Frequency Ratio of Al⁺and Hg⁺Single-Ion Optical Clocks; Metrology at the 17th Decimal Place

T. Rosenband, David Hume, Piet O. Schmidt et al. · Science · 2008 · 1.4K citations · Full text

Engineering, Physics, Instrumentation +15

Optical Frequency Synthesizer for Precision Spectroscopy

Ronald Holzwarth, Th. Udem, Theodor W. Hänsch et al. · Physical Review Letters · 2000 · 1.2K citations

Engineering, Electrical Engineering, Physics +17

Direct Link between Microwave and Optical Frequencies with a 300 THz Femtosecond Laser Comb

Scott A. Diddams, David J. Jones, Jun Ye et al. · Physical Review Letters · 2000 · 1.1K citations · Full text

Engineering, Physics, Optics +16

Test of Relativistic Gravitation with a Space-Borne Hydrogen Maser

R. F. C. Vessot, M. W. Levine, E. M. Mattison et al. · Physical Review Letters · 1980 · 643 citations

Natural Sciences, Astronomy, Physics +13

Sr Lattice Clock at 1 × 10 ^–16 Fractional Uncertainty by Remote Optical Evaluation with a Ca Clock

Andrew D. Ludlow, Tanya Zelevinsky, Gretchen K. Campbell et al. · Science · 2008 · 549 citations · Full text

Engineering, Physics, Metrology +13