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In this paper we present a technique for the precise measurement of electricdipole allowed transitions in trapped ions. By applying a probe and a coolinglaser in quick succession, the full transition can be probed without causingdistortion from heating the ion. In addition, two probes can be utilized tomeasure a dispersion-like signal, which is well suited to stabilizing the laserto the transition. We have fully characterized the parameters for themeasurement and find that it is possible to measure the transition frequency tobetter than 100kHz with an interrogation time of 30s. The long-term stabilityof the spectroscopy signal is determined by employing two independent ion trapsystems. The first ion trap is used to stabilize the spectroscopy laser. Thesecond ion trap is then employed to measure the stability by continuouslyprobing the transition at two frequencies. From the Allan variance a frequencyinstability of better than 10$^{-10}$ is obtained for an interrogation time of1000s.

Precision spectroscopy technique for dipole allowed transitions in laser cooled ions