The absolute frequency of the 87Sr optical clock transition
By G. Campbell, A. Ludlow, S. Blatt, J. Thomsen, Michael J. Martin, M. D. de Miranda, T. Zelevinsky, M. Boyd, Jun Ye, Scott A. Diddams and 3 more. 2008
139 citations recorded by the source corpus.
The absolute frequency of the 1S0–3P0 clock transition of 87Sr has been measured to be 429 228 004 229 873.65 (37) Hz using lattice-confined atoms, where the fractional uncertainty of 8.6 × 10−16 represents one of the most accurate measurements of an atomic transition frequency to date. After a detailed study of systematic effects, which reduced the total systematic uncertainty of the Sr lattice clock to 1.5 × 10−16, the clock frequency is measured against a hydrogen maser which is simultaneously calibrated to the US primary frequency standard, the NIST Cs fountain clock, NIST-F1. The comparison is made possible using a femtosecond laser based optical frequency comb to phase coherently connect the optical and microwave spectral regions and by a 3.5 km fibre transfer scheme to compare the remotely located clock signals.
Subfields: Atomic and Molecular Physics, and Optics, Statistics and Probability
View Paper: https://www.semanticscholar.org/paper/c934f5f0e2c8d4ac759fae7f703cac61f9cb0ae2
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Citations in the corpus
- JILA SrI optical lattice clock with uncertainty of 2.0×10−18 (2019, methodology): “A history of evaluations of the Sr second order Zeeman coefficient completed by the PTB [8], SYRTE [29], and JILA [1, 2, 30] Sr OLCs.”
- A strontium lattice clock with 3 × 10 − 17 ?> inaccuracy and its frequency (2013, methodology): “The frequencies are taken from these publications: JILA 07 [61], SYRTE 08 [62], JILA 08 [63], UT 09 [64], PTB 11 [21], NICT-a 12 [65], NICT-b 12 [66], SYRTE 13 [7] and NMIJ 14 [67] while PTB 13 is obtained in this work.”
- Colloquium: Physics of optical lattice clocks (2010, methodology): “The contender status of the lattice clocks was further solidified in 2008 when the international frequency com- 3 parison carried out in Boulder (Campbell et al., 2008), Paris (Baillard et al., 2008), and Tokyo (Hong et al., 2009), agreed with a fractional uncertainty of 6 × 10−16 that was only limi”