Abstract
Optical frequency standards based on narrow absorptions in laser-cooledsingle trapped ions have recently begun to demonstrate stabilities that arecompetitive with cold atom fountain microwave standards. This paperpresents a short review of the wider state-of-the-art development of thesesingle cold trapped ion frequency standards, coupled with a more detailedaccount of recent results achieved at National Physical Laboratory inrespect of single ion systems based on 88Sr+, 87Sr+ and 171Yb+.Narrow linewidth data for the optical clock quadrupole and octupoletransitions respectively at 674 nm in 88Sr+and 467 nm in 171Yb+, arepresented, together with a discussion of current systematics and futureprojections. The potential for optical clock operation is outlined.
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