Title :
Characterization of a 88Sr+ optical frequency standard at 445 THz by two-trap comparison
Author :
Barwood, Gp ; Gill, P. ; Huang, G. ; Klein, Ha
Author_Institution :
Nat. Phys. Lab., Teddington, UK
Abstract :
Frequency stability and comparison measurements have been undertaken between a pair of optical frequency standards based on the 2S½ - 2D5/2 transition in independent trapped 88Sr+ ions confined in two end-cap traps. A frequency stability of 2.5 × 10-16 at 4000 s has been measured, improving as τ-½. A null frequency offset at the 3 × 10-16 level has been measured. A measurement of the ratio of the g-factors between the 2S½ and 2D5/2 levels has been made and indicates a small departure from LS coupling in the ion.
Keywords :
atom-photon collisions; frequency standards; g-factor; laser frequency stability; laser transitions; positive ions; radiation pressure; strontium; trapped ions; 88Sr+; LS coupling; end-cap traps; frequency 445 THz; frequency measurements; frequency stability; g-factors; independent trapped ions; null frequency offset; optical frequency standard; two-trap comparison; Distributed feedback devices; Frequency measurement; Laser stability; Optical variables control; Optical variables measurement; Particle beam optics; Standards; Frequency measurement; frequency control; laser stability;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2012 Conference on
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4673-0439-9
DOI :
10.1109/CPEM.2012.6250906
