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
Subjects
Doppler shift
Frequency measurement
Laboratories
Measurement standards
Microwave frequencies
Microwave measurements
Motion measurement
Noise measurement
Pulse measurements
Thermal stability
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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