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Frequency stability and comparison measurements have been undertaken between a pair of optical frequency standards based on the 2S½ - 2D5/2 transition in independent trapped 88Sr+ ions confined in two end-cap traps. A frequency stability of 2.5 × 10−16 at 4000 s has been measured, improving as τ−½. A null frequency offset at the 3 × 10−16 level has been measured. A measurement of the ratio of the...
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 688 358 979 309 310 plusmn 9 Hz. This corresponds to a fractional uncertainty of 1.3 times 10-14.
A compact and simplified 13C2H2 optical frequency standard is currently under development at NPL. The standard uses an inexpensive, commercially available 20 mW DFB diode laser, which is stabilized to line P(16) of the nu1 + nu3 band at 1542 nm in an experimental arrangement which dispenses with the need for an enhancement cavity. Preliminary stability and reproducibility data will be presented.
Two 674-nm optical frequency standards based on the 2S1/2 - 2D5/2 transition in 88Sr+ are under development at NPL. Comparison of the standards allows determination of the frequency stability and reproducibility via difference frequency measurements. A relative frequency stability between the traps of ap3times10-15 over a 100 s averaging time has been observed. A compact, transportable system is also...
Forbidden transitions in single laser-cooled trapped ions provide highly stable and accurate references for optical frequency standards. This paper describes recent progress on strontium and ytterbium ion optical frequency standards under development at NPL.
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