The CSIRO trapped /sup 171/Yb/sup +/ ion clock: improved accuracy through laser-cooled operation

The microwave frequency standard based on buffer gas-cooled /sup 171/Yb/sup +/ ions at the CSIRO National Measurement Laboratory has demonstrated high stability, but has an accuracy limited by the second-order Doppler shift due to the thermal motion of the ions. We report measurements obtained with...

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Bibliographic Details
Published inProceedings of the 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium (Cat. No.99CH36313) Vol. 1; pp. 125 - 128 vol.1
Main Authors Warrington, R.B., Fisk, P.T.H., Wouters, M.J., Lawn, M.A., Coles, C.
Format Conference Proceeding
LanguageEnglish
Published IEEE 1999
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Summary:The microwave frequency standard based on buffer gas-cooled /sup 171/Yb/sup +/ ions at the CSIRO National Measurement Laboratory has demonstrated high stability, but has an accuracy limited by the second-order Doppler shift due to the thermal motion of the ions. We report measurements obtained with a cloud of approximately 10/sup 4/ ions laser-cooled to below 1 K, including near shot noise-limited Ramsey fringes with a pulse separation up to 10 s. Estimates indicate that a potential stability of /spl sigma//sub y/(/spl tau/)=5/spl times/10/sup -14/ /spl tau//sup -1/2/ and a total uncertainty of 5 parts in 10/sup 15/ or better are achievable for this system.
ISBN:9780780354005
0780354001
ISSN:1075-6787
DOI:10.1109/FREQ.1999.840724