Abstract
Research on the development of the optical frequency standard based on trapped and cold 40Ca+ with the 4s 2S1/2-3d 2D5/2 clock transition at 729 nm is reported. A single calcium ion was trapped and laser cooled in the Paul trap and stay in trap for more than 15 days. The linewidth of a 729 nm laser was reduced to less than 10 Hz by locking to a cavity for longer than 50 hours uninterruptedly. The overall systematic uncertainty of the clock transition has been characterized to be better than 6.5×10−16. The absolute frequency of the clock transition was measured at 10−15 level using an optical frequency comb referenced to a Hydrogen maser, which was calibrated to the SI second through the global positioning system (GPS). The frequency value was 411042129776393.0(1.6) Hz after the correction of the systematic shifts.
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Gao, K. Optical frequency standard based on a single 40Ca+ . Chin. Sci. Bull. 58, 853–863 (2013). https://doi.org/10.1007/s11434-012-5646-5
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DOI: https://doi.org/10.1007/s11434-012-5646-5