A Ca optical frequency standard based on ultra-cold atoms

Author

Helmcke, J. ; Wilpers, G. ; Degenhardt, C. ; Binnewies, T. ; Sterr, U. ; Riehle, F.

Author_Institution

Phys. Tech. Bundesanstalt, Braunschweig, Germany

fYear

2002

fDate

16-21 June 2002

Firstpage

154

Lastpage

155

Abstract

With recently developed strategies to reduce frequency offsets due to residual first-order Doppler effects the relative uncertainty of the Ca optical frequency standard at PTB was reduced to 2.7-10/sup -14/. The weighted mean of the optical frequency measured by a harmonic frequency chain and recently by a femtosecond laser comb is (455 986 240 494 154 /spl plusmn/ 13) Hz. The use of ultra-cold atoms prepared by a novel two-stage cooling method will allow to further reduce frequency offsets.

Keywords

Doppler effect; calcium; frequency standards; measurement uncertainty; optical variables measurement; trapped ions; 455986240494141 to 455986240494167 Hz; Ca; PTB; femtosecond laser comb; frequency offsets; harmonic frequency chain; optical frequency standard; relative uncertainty; residual first-order Doppler effects; two-stage cooling method; ultra-cold atoms; weighted mean; Atom optics; Atomic beams; Atomic measurements; Calcium; Cooling; Frequency measurement; Laser transitions; Optical interferometry; Optical scattering; Ultrafast optics;

fLanguage

English

Publisher

ieee

Conference_Titel

Precision Electromagnetic Measurements, 2002. Conference Digest 2002 Conference on

Conference_Location

Ottawa, Ontario, Canada

Print_ISBN

0-7803-7242-5

Type

conf

DOI

10.1109/CPEM.2002.1034764

Filename

1034764