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We report on precision laser spectroscopy of the 2S1/2(F = 0) 2D3/2 (F = 2, mF = 0) clock transition in a single ion of 171Yb+. The absolute value of the transition frequency, determined using an optical frequency comb referenced to a hydrogen maser, is 688358979309310 ?? 9 Hz. This corresponds to a fractional frequency uncertainty of 1.3 ?? 10-14.
A second femtosecond optical frequency comb has been implemented at NPL. This higher repetition rate system offers several advantages over our existing comb, and enables the accuracy of the frequency measurement process to be tested. Results of absolute frequency measurements carried out using the two different systems are compared
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