Optical Clocks Based on Ultracold Neutral Strontium Atoms
نویسندگان
چکیده
Ultra-cold alkaline earth atoms show great promise as future optical frequency standards and as key components in optical atomic clocks. Atomic strontium is an exciting candidate for a future standard as the level structure provides multiple narrow clock transitions as well as means for efficient laser cooling to μK temperatures. A variety of measurement techniques are currently being explored for the strontium clock transitions including, free space spectroscopy of the narrow (7.5kHz) S0-P1 transition in cold bosonic Sr [1], optical lattice based spectroscopy of the sub-Hz hyperfine induced S0-P0 transition in fermionic Sr [2], and indirect spectroscopy of the strictly forbidden S0P0 transition in Sr using an electromagnetically-induced-transparency (EIT) resonance [3, 4]. In the case of the S0P0 transitions in Sr and Sr, accuracies (stabilities) have been estimated to eventually reach below the 10 (10) level.
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