The 199 Hg + single ion optical clock : recent progress
نویسندگان
چکیده
We report on work directed toward the systematic evaluation of an optical frequency standard based on the S1/2–D5/2 transition of a single, laser-cooled, trapped 199Hg+ ion, whose resonance frequency is 1.06 × 1015 Hz. For the purpose of the evaluation, two 199Hg+ standards have been constructed. In the cooling-laser system built for the second standard, an injection-locking scheme has been applied to a cw Ti:sapphire laser. We also report optical frequency measurements of the clock transition performed over the past 21 months with the first standard. During this term, the variation of the clock transition frequency is found to be less than one part in 1014. (Some figures in this article are in colour only in the electronic version)
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