The absolute frequency of the87Sr optical clock transition

Autor:	Steven R. Jefferts, Jan W. Thomsen, Jun Ye, Thomas E. Parker, Tanya Zelevinsky, Marcio H. G. de Miranda, Scott A. Diddams, Sebastian Blatt, Andrew D. Ludlow, Thomas P. Heavner, Michael J. Martin, Martin M. Boyd, Gretchen K. Campbell
Rok vydání:	2008
Předmět:	Physics Atomic Physics (physics.atom-ph) business.industry Clock rate General Engineering Phase (waves) FOS: Physical sciences Hydrogen maser Frequency standard Laser Physics - Atomic Physics law.invention Optics law Femtosecond NIST Physics::Atomic Physics Atomic physics business Microwave
Zdroj:	Metrologia. 45:539-548
ISSN:	1681-7575 0026-1394
DOI:	10.1088/0026-1394/45/5/008
Popis:	The absolute frequency of the 1S0-3P0 clock transition of 87Sr has been measured to be 429 228 004 229 873.65 (37) Hz using lattice-confined atoms, where the fractional uncertainty of 8.6x10-16 represents one of the most accurate measurements of an atomic transition frequency to date. After a detailed study of systematic effects, which reduced the total systematic uncertainty of the Sr lattice clock to 1.5x10-16, the clock frequency is measured against a hydrogen maser which is simultaneously calibrated to the US primary frequency standard, the NIST Cs fountain clock, NIST-F1. The comparison is made possible using a femtosecond laser based optical frequency comb to phase coherently connect the optical and microwave spectral regions and by a 3.5 km fiber transfer scheme to compare the remotely located clock signals.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::02ef0ae96b5c9494c67420c7f62f010c https://doi.org/10.1088/0026-1394/45/5/008 Zobrazit plný text záznamu