Pulsed interrogation in an atomic clock based on coherent

Pulsed interrogation in an atomic
clock based on coherent population
trapping
TECHNICAL DESCRIPTION
Notre référence :
86403-01
Status des brevets
French patent
application FR0403289
filed on March 30th,
2004 entitled "Procédé
de generation d’un
signal d’horloge
atomique à piégeage
coherent de population
et horologe atomique"
This invention describes a process to generate an atomic clock signal and the
corresponding atomic clock. The description concerns : - On the one hand, the pulsed
interrogation in a clock based on coherent population trapping. The amplitude of the
optical signal is not constant, but is periodically modulated. The signal measured at the
pulse (n) is depending of the atomic state created at the pulse (n-1) and of its evolution
during the time between both pulses. - On the other hand, the clock signal generation. It is
based on the difference between the measured signals during the different pulses, which
allows to increase the clock signal contrast, while rejecting the slow fluctuations of the
lasers parameters used for the interrogation.
INDUSTRIAL APPLICATIONS
This innovation could be used for all the systems requiring a very stable and precise
frequency reference (GPS receivers or synchronization systems of the telecommunication
network for example).
For further information, please contact us (Ref 86403-01)
Inventeurs
Noel DIMARCQ
André CLAIRON
Emeric DE CLERCQ
Stéphane GUERANDEL
Thomas ZANON
David HOLLEVILLE
Status Commercial
Exclusive or nonexclusive licenses
Laboratoires
Laboratoire SYRTE
(Système de Référence
Temps-Espace), a
research laboratory of
Centre National de la
recherche scientifique
(CNRS, UMR 8630),
Paris, France.
Mots clés :
Atomic clock Coherent
Population Trapping
(CPT)
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