Precision Isotope Shift Measurements in Calcium Ions Using Quantum Logic Detection Schemes.
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 2D(3/2)→2P(1/2) transition in calcium, resulting in a transition frequency of f=346 000 234 867(96)  kHz. Furthermore, we determine the isotope shift of this transition and the 2S(1/2)→2P(1/2) transition for 42Ca+, 44Ca+, and 48Ca+ ions relative to 40Ca+ 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.
Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
Florian
F
Gebert
Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
Yong
Y
Wan
Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.
Fabian
F
Wolf
School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales 2052, Australia.
Christopher N
CN
Angstmann
School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia.
Julian C
JC
Berengut
Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany.|Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany.
Piet O
PO
Schmidt