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12 September 2007 Optical frequency standards based on mercury and aluminum ions
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Single-trapped-ion frequency standards based on a 282 nm transition in 199Hg+ and on a 267 nm transition in 27Al+ have been developed at NIST over the past several years. Their frequencies are measured relative to each other and to the NIST primary frequency standard, the NIST-F1 cesium fountain, by means of a self-referenced femtosecond laser frequency comb. Both ion standards have demonstrated instabilities and inaccuracies of less than 1 × 10-16.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
W. M. Itano, J. C. Bergquist, A. Brusch, S. A. Diddams, T. M. Fortier, T. P. Heavner, L. Hollberg, D. B. Hume, S. R. Jefferts, L. Lorini, T. E. Parker, T. Rosenband, and J. E. Stalnaker "Optical frequency standards based on mercury and aluminum ions", Proc. SPIE 6673, Time and Frequency Metrology, 667303 (12 September 2007);


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