Title :
Prospects for frequency comparison of Sr and Hg optical lattice clocks toward 10−18 uncertainties
Author :
Katori, H. ; Takamoto, M. ; Takano, T. ; Ushijima, I. ; Ohkubo, T. ; Yamanaka, K. ; Ohmae, N. ; Aso, Y. ; Shoda, A. ; Ushiba, T. ; Thoumany, P. ; Das, M. ; Christensen, B.T.R. ; Akatsuka, T.
Author_Institution :
Dept. of Appl. Phys., Univ. of Tokyo, Tokyo, Japan
Abstract :
We are developing optical lattice clocks with a scope of attaining 10-18 fractional uncertainty. Cryogenic silicon cavity targeting 2×10-17 stability at 1s, will allow full utilization of the potential stability of optical lattice clocks. In order to reduce the blackbody radiation shift, which is the most serious source of uncertainties, Sr clocks in cryogenic environment and Hg clocks are underdevelopment. We discuss prospects for clock comparison, no dead time operation of the clocks and fiber link of the clocks between Riken and the University of Tokyo.
Keywords :
atomic clocks; blackbody radiation; cryogenics; frequency measurement; mercury (metal); optical lattices; strontium; Hg; Hg clocks; Si; Sr clocks; blackbody radiation shift; cryogenic silicon cavity; dead time operation; fiber link; fractional uncertainty; frequency comparison; optical lattice clocks; Atomic clocks; Cavity resonators; Laser stability; Lattices; Noise; Uncertainty;
Conference_Titel :
Frequency Control Symposium (FCS), 2012 IEEE International
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4577-1821-2
DOI :
10.1109/FCS.2012.6243688