Title :
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
fDate :
4/1/2005 12:00:00 AM
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;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2004.843388
