Title :
Recent Improvements in NIST-Fl and Resulting Accuracies of δf/f<7x10-16
Author :
Heavner, T.P. ; Jefferts, S.R. ; Donley, E.A. ; Shirley, J.H. ; Parker, T.E.
Author_Institution :
Time & Frequency Div., National Inst. of Stand. & Technol., Boulder, CO
fDate :
June 27 2004-July 2 2004
Abstract :
Since our last publication describing the accuracy budget for NIST-FI (a laser-cooled Cs fountain primary frequency standard) the authors have made many improvements resulting in nearly a factor of 2 reduction in the uncertainty in the realization of the SI second. Recently the authors reported a combined standard fractional uncertainty of 0.67times10-15
Keywords :
Zeeman effect; blackbody radiation; frequency standards; measurement uncertainty; NIST-F1; accuracy budget; laser-cooled fountain; primary frequency standard; standard fractional uncertainty; uncertainty reduction; Atomic beams; Fiber lasers; Laser theory; Masers; Optical noise; Optical scattering; Packaging; Physics; Power lasers; Uncertainty;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2004 Conference on
Conference_Location :
London
Print_ISBN :
0-7803-8493-8
Electronic_ISBN :
0-7803-8494-6
DOI :
10.1109/CPEM.2004.305330
