List of atomic clocks

This is a list of some experimental laboratory atomic clocks worldwide.

Name Operation date Type Accuracy Location Image CS1 1969 Cs CS2 1985 Cs CS3 1988 Cs CS4 1992-2005 Cs CSF1 1999 Cs fountain CSF2 2009 Cs fountain FOCS NPL-CsF2, Yb+ and Sr+ ion clocks, Sr lattice clock, 4 hydrogen masers NIST Ion Clock 2025 Charged Al ion with Mg ion NIST-F1 Cs fountain NIST-F2 Cs fountain USNO Alternate Master Clock WWV Department of Defense master clock 18 cesium atomic clocks and 4 hydrogen maser clocks Cs, H Optical lattice clock NMIJ-F1, NMIJ-F2 Cs fountain Optical clock 2012 Ca ion Caesium Beam Atomic Clock Cs 9 Agilent 5071A caesium clocks Cs KRISS-1 Cs Caesium atomic clocks Cs Five caesium clocks, one passive hydrogen maser, two active hydrogen masers Cs, H DOST-PAGASA Juan Time Caesium clocks, Hydrogen Maser Cs SOC: Space Optical Clock breadboard (Sr lattice clock) Sr lattice Deep Space Atomic Clock 2019-2021 Hg ion Caesium atomic clocks Cs

References