LNE-SYRTE, Observatoire de Paris, Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie (UPMC), Paris, France.
IEEE Trans Ultrason Ferroelectr Freq Control. 2012 Mar;59(3):411-5. doi: 10.1109/TUFFC.2012.2209.
We report on the observation of a dc Stark frequency shift at the 10-(13) level by comparing two strontium optical lattice clocks. This frequency shift arises from the presence of electric charges trapped on dielectric surfaces placed under vacuum close to the atomic sample. We show that these charges can be eliminated by shining UV light on the dielectric surfaces, and characterize the residual dc Stark frequency shift on the clock transition at the 10-(18) level by applying an external electric field. This study shows that the dc Stark shift can play an important role in the accuracy budget of lattice clocks, and should be duly taken into account.
我们通过比较两个锶光学晶格钟，观察到了 10-(13)能级的直流斯塔克频移。这个频移是由放置在靠近原子样品的真空环境中的介电表面上的电荷引起的。我们表明，通过照射介电表面的紫外光可以消除这些电荷，并通过施加外部电场来表征在 10-(18)能级的钟跃迁上的残余直流斯塔克频移。这项研究表明，直流斯塔克频移在晶格钟的精度预算中可能扮演重要角色，因此应该加以适当考虑。
