Abstract
We demonstrate an efficient high-precision optical spectroscopy technique for single trapped ions with nonclosed transitions. In a double-shelving technique, the absorption of a single photon is first amplified to several phonons of a normal motional mode shared with a cotrapped cooling ion of a different species, before being further amplified to thousands of fluorescence photons emitted by the cooling ion using the standard electron shelving technique. We employ this extension of the photon recoil spectroscopy technique to perform the first high precision absolute frequency measurement of the transition in calcium, resulting in a transition frequency of . Furthermore, we determine the isotope shift of this transition and the transition for , , and ions relative to with an accuracy below 100 kHz. Improved field and mass shift constants of these transitions as well as changes in mean square nuclear charge radii are extracted from this high resolution data.
- Received 15 April 2015
DOI:https://doi.org/10.1103/PhysRevLett.115.053003
© 2015 American Physical Society