Free expanding cloud of cold atoms as an atomic standard

Ramsey fringes contrast

Stella Torres Müller*, Daniel Varela Magalhães, Aida Bebeachibuli, Tiago Almeida Ortega, Mushtaq Ahmed, Vanderlei Salvador Bagnato

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)909-914
Number of pages6
JournalJournal of the Optical Society of America B: Optical Physics
Issue number6
Publication statusPublished - 2008
Externally publishedYes

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