Title :
Higher order effects in a Sr optical lattice clock
Author :
Brusch, Anders ; Le Targat, Rodolphe ; Baillard, Xavier ; Fouche, Mathilde ; Lemonde, Pierre
Author_Institution :
LNE-SYRTE, Obs. de Paris, Paris, France
Abstract :
We report the observation of the higher order frequency shift due to the trapping field in a 87Sr optical lattice clock. We show that at the magic wavelength of the lattice, where the first order term cancels, the higher order shift will not constitute a limitation to the fractional accuracy of the clock at a level of 10-18. This result is achieved by operating the clock at very high trapping intensity up to 400 kW/cm2 and by a specific study of the effect of the two two-photon transitions near the magic wavelength.
Keywords :
atom-photon collisions; atomic clocks; optical lattices; radiation pressure; strontium; two-photon processes; 87Sr; fractional accuracy; higher order frequency shift; magic wavelength; optical lattice clock; trapping field; trapping intensity; two-photon transitions; Atomic beams; Atomic clocks; Atomic measurements; Charge carrier processes; Lattices; Probes;
Conference_Titel :
Frequency and Time Forum (EFTF), 2006 20th European
Conference_Location :
Braunschweig
Print_ISBN :
978-1-4673-2642-1
