Influence of chirped excitation pulses in an optical clock with ultracold calcium atoms

Author

Degenhardt, Carsten ; Nazarova, Tatiana ; Lisdat, Christian ; Stoehr, Hardo ; Sterr, Uwe ; Riehle, Fritz

Author_Institution

Philips Res. Labs., Aachen, Germany

Volume

54

Issue

2

fYear

2005

fDate

4/1/2005 12:00:00 AM

Firstpage

771

Lastpage

775

Abstract

We have investigated the influence of frequency chirps of the excitation pulses in a time-domain optical Ramsey-Borde´ atom-interferometer used in an optical clock with ultracold calcium atoms. With optical interferometry, we identify a ringing in the excitation pulses to be responsible for the observed frequency shifts. Using these results, the uncertainty of the latest frequency measurement could be reduced to 1.2·10^-14.

Keywords

calcium; chirp modulation; clocks; frequency standards; laser cooling; magneto-optical effects; optical modulation; particle interferometry; time measurement; Ca; atom interferometry; excitation pulses; frequency chirps; frequency measurement; frequency shifts; measurement uncertainty; optical Ramsey-Borde atom-interferometer; optical clock; optical frequency standards; optical interferometry; ultracold calcium atoms; Atom optics; Atomic beams; Atomic measurements; Calcium; Chirp; Clocks; Frequency; Laser transitions; Optical interferometry; Optical pulses; Atom interferometry; optical frequency standards;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2004.843388

Filename

1408285