The 87-Sr optical frequency standard at PTB

Abstract

With 87-Sr atoms confined in a one dimensional optical lattice, the frequency of the optical clock transition 5s^2 ^1S_0 - 5s5p ^3P_0 has been determined to be 429 228 004 229 872.9(5) Hz. The transition frequency was measured with the help of a fs-frequency comb against one of PTB's H-masers whose frequency was measured simultaneously by the PTB Cs fountain clock CSF1. The Sr optical frequency standard contributes with a fractional uncertainty of 1.5 10^-16 to the total uncertainty. The agreement of the measured transition frequency with previous measurements at other institutes supports the status of this transition as secondary representation of the second with the currently smallest uncertainty.

9 pages, 6 figures

References in corpus (12)

• Sr lattice clock at 1x10^{-16} fractional uncertainty by remote optical evaluation with a Ca clock
• Multipolar theory of black-body radiation shift of atomic energy levels and its implications for optical lattice clocks
• Nuclear Spin Effects in Optical Lattice Clocks
• Suppression of collisional shifts in a strongly interacting lattice clock
• The absolute frequency of the 87Sr optical clock transition
• Cascaded multiplexed optical link on a telecommunication network for frequency dissemination
• Lattice Induced Frequency Shifts in Sr Optical Lattice Clocks at the $10^{-17}$ Level
• Probing Interactions between Ultracold Fermions
• Measuring the frequency of a Sr optical lattice clock using a 120-km coherent optical transfer
• An Optical Lattice Clock with Spin-polarized 87Sr Atoms
• Decoherence and Collisional Frequency Shifts of Trapped Bosons and Fermions
• Demonstration of a Transportable 1 Hz-Linewidth Laser

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