Abstract
The current state of our single indium ion work will be presented, with emphasis on the construction of a narrow, solid-state source of tunable UV radiation which will serve as a “clock” laser for the single-ion standard. Indium is shown to be a favorable candidate for a standard with a long term inaccuracy of less than one part in 1017. Its advantages are small systematic errors which are well-understood and relatively straightforward generation of the cooling and “clock” radiation. The stringent requirements on the long term stability of the “flywheel” clock laser and the difficulty in coherently relating the optical clock laser frequency to a convenient microwave source are problems which should soon be overcome.
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