List of atomic clocks
From Wikipedia, the free encyclopedia
This is a list of some experimental laboratory atomic clocks worldwide.
| Name | Operation date | Type | Accuracy | Location | Image |
|---|---|---|---|---|---|
| CS1[1] | 1969 | Cs | 7×10−15 | ||
| CS2[2] | 1985 | Cs | 1.2×10−14 |  | |
| CS3 | 1988 | Cs | |||
| CS4 | 1992-2005 | Cs | .jpg) | ||
| CSF1[3] | 1999 | Cs fountain | 4×10−16 | ||
| CSF2[4] | 2009 | Cs fountain | 2×10−16 | ||
| FOCS | |||||
| NPL-CsF2, Yb+ and Sr+ ion clocks, Sr lattice clock, 4 hydrogen masers[5][6] | |||||
| NIST Ion Clock | 2025 | Charged Al ion with Mg ion | 5.5×10−19 | ||
| NIST-F1[8] | Cs fountain | 3.1×10−16 |  | ||
| NIST-F2[10] | Cs fountain | 1.1×10−16 |  | ||
| 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[17] | Cs fountain | 4.7×10−16 | |||
| Optical clock[18] | 2012 | Ca ion | |||
| Caesium Beam Atomic Clock[19][20] | Cs | ||||
| 9 Agilent 5071A caesium clocks[22] | Cs | 5×10−13 | |||
| KRISS-1[24][25] | Cs | 1×10−14 |  | ||
| Caesium atomic clocks[26] | Cs | ||||
| Five caesium clocks, one passive hydrogen maser, two active hydrogen masers[27] | Cs, H | ||||
| DOST-PAGASA Juan Time[28] | |||||
| Caesium clocks, Hydrogen Maser[29] | Cs | ||||
| SOC: Space Optical Clock breadboard (Sr lattice clock)[30] | Sr lattice |  | |||
| Deep Space Atomic Clock[31] | 2019-2021 | Hg ion | |||
| Caesium atomic clocks[32] | Cs |
