Abstract
We report recent improvement in absolute frequency measurement of the 115In+ 5s2 1S0−5s5p 3P0 clock transition at 236.5 nm. Using a narrowline laser as a local oscillator, a linewidth of 43 Hz for the transition is resolved, as shown in Fig. la. The uncertainty of the transition frequency's centroid is 18 Hz, leading to a fractional uncertainty of 1.4 × 10−14. In the experiment, a single 115In+ is trapped in a three-ring Paul-Straubel trap and laser cooled to the trap's vibrational ground states. A monolithic, isolated, end-pumped ring Nd: YAG clock laser (MISER, 946 nm), locked to a high finesse, ultra-low expansion cavity, serves as the master local oscillator. Its fourth harmonic at 236.5 nm is scanned through the 5s2 1S0−5s5p 3P0 clock transition and the resonance is detected using the electron shelving method, by detecting the fluorescence signal of the 5s2 1S0−5s5p 3P1 cooling transition.
© 2007 IEEE
PDF ArticleMore Like This
Nozomi Ohtsubo, Ying Li, Kensuke Matsubara, Tetsuya Ido, and Kazuhiro Hayasaka
PD_2_9 The European Conference on Lasers and Electro-Optics (CLEO/Europe) 2017
Nozomi Ohtsubo, Ying Li, Kensuke Matsubara, Tetsuya Ido, and Kazuhiro Hayasaka
PD_2_9 European Quantum Electronics Conference (EQEC) 2017
E. Peik, G. Hollemann, and H. Walther
QMA5 European Quantum Electronics Conference (EQEC) 1994