Precision lifetime measurements of a single trapped ion with ultrafast laser pulses

Abstract

We report precision measurements of the excited state lifetime of the $5p$ ${}^2{P}_{1/2}$ and $5p$ ${}^2{P}_{3/2}$ levels of a single trapped Cd${}^{+}$ ion. The ion is excited with picosecond laser pulses from a mode-locked laser and the distribution of arrival times of spontaneously emitted photons is recorded. The resulting lifetimes are 3.148 $\pm$ 0.011 ns and 2.647 $\pm$ 0.010 ns for ${}^2{P}_{1/2}$ and ${}^2{P}_{3/2}$ respectively. With a total uncertainty of under 0.4%, these are among the most precise measurements of any atomic state lifetimes to date.

4 pages with 3 figures