Precision spectroscopy in Yb+ ions
Jialiang Yu, Kai C. Grensemann, Chih-Han Yeh, Ikbal Ahamed Biswas, Abhilasha Singh, Laura S. Dreissen, Henning A. Fürst, Tanja E. Mehlstäubler
Published: 2025/9/29
Abstract
We report on our progress on multi-ion spectroscopy with Yb+ ions. We first characterized the spatial homogeneity of the magnetic- and the rf-field. Subsequently, to equalize the immense AC Stark shifts of the individual ions in a Coulomb crystal, we utilize a holographic phase plate to convert the Gaussian beam into a flat-top shape. These efforts enable us to excite an 8-ion crystal (172Yb+) on the highly forbidden electric octupole transition. Using 173Yb+ with reduced AC Stark shift, the same beam profile could support the multi-ion operation of 20 ions. This paves the way for future multi-ion optical clocks.