TY - JOUR
T1 - Free expanding cloud of cold atoms as an atomic standard
T2 - Ramsey fringes contrast
AU - Müller, Stella Torres
AU - Magalhães, Daniel Varela
AU - Bebeachibuli, Aida
AU - Ortega, Tiago Almeida
AU - Ahmed, Mushtaq
AU - Bagnato, Vanderlei Salvador
PY - 2008
Y1 - 2008
N2 - A compact frequency standard based on an expanding cold 133Cs cloud is under development in our laboratory. In a first experiment, Cs cold atoms were prepared by a magneto-optical trap in a vapor cell, and a microwave antenna was used to transmit the radiation for the clock transition. The signal obtained from fluorescence of the expanding cold atoms cloud is used to lock a microwave chain. In this way the overall system stability is evaluated. A theoretical model based on a two-level system interacting with the two microwave pulses enables interpretation for the observed features, especially the poor Ramsey fringes contrast.
AB - A compact frequency standard based on an expanding cold 133Cs cloud is under development in our laboratory. In a first experiment, Cs cold atoms were prepared by a magneto-optical trap in a vapor cell, and a microwave antenna was used to transmit the radiation for the clock transition. The signal obtained from fluorescence of the expanding cold atoms cloud is used to lock a microwave chain. In this way the overall system stability is evaluated. A theoretical model based on a two-level system interacting with the two microwave pulses enables interpretation for the observed features, especially the poor Ramsey fringes contrast.
UR - http://www.scopus.com/inward/record.url?scp=50449104546&partnerID=8YFLogxK
U2 - 10.1364/JOSAB.25.000909
DO - 10.1364/JOSAB.25.000909
M3 - Article
AN - SCOPUS:50449104546
VL - 25
SP - 909
EP - 914
JO - Journal of the Optical Society of America B: Optical Physics
JF - Journal of the Optical Society of America B: Optical Physics
SN - 0740-3224
IS - 6
ER -