Accuracy evaluation of the optically pumped Cs frequency standard at NRLM

The optically pumped cesium (Cs) frequency standard at the National Research Laboratory of Metrology, Ibaraki, Japan (NRLM), NRLM-4, was modified in various ways in order to improve frequency stability and accuracy, We determined the frequency stability by comparing the phase with that of a hydrogen...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 1999-04, Vol.48 (2), p.496-499
Main Authors: Hagimoto, K., Ohshima, S., Nakadan, Y., Koga, Y.
Format: Article
Language:English
Subjects:
Atomic measurements
Cesium
Deviation
Frequency estimation
Frequency measurement
Frequency stability
Frequency standards
Hydrogen
Hydrogen masers
Instrumentation
Laboratories
Masers
Metrology
Optical pumping
Stability
Time measurement
Uncertainty
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Summary:The optically pumped cesium (Cs) frequency standard at the National Research Laboratory of Metrology, Ibaraki, Japan (NRLM), NRLM-4, was modified in various ways in order to improve frequency stability and accuracy, We determined the frequency stability by comparing the phase with that of a hydrogen maser: the Allan deviation was /spl sigma//sub y/(/spl tau/)=5/spl times/10/sup -13///spl radic//spl tau/. We estimated the frequency corrections and uncertainties due to various sources, and the total uncertainty was found to be 2.9/spl times/10/sup -14/. The frequency difference between NRLM-4 and the international atomic time (TAI) was also measured.
ISSN:0018-9456
1557-9662
DOI:10.1109/19.769640