Demonstration and Observation of a Frequency Standard Based on an Expanding Cold Atoms Cloud of Cesium

Stella Torres Müller, Daniel Varela Magalhães, Aida Bebeachibuli, Mônica Silva Santos, Vanderlei Salvador Bagnato

Abstract:	This work reports the first results obtained in a laboratory system implemented to be a primary standard based on an expanding cloud of cold 133Cs. An atomic sample is prepared through the magneto-optical trapping technique, and after the loading procedure the atomic cloud is left to freely expand. A microwave interrogation signal is applied to the atoms, probing them in the ground state transition 6S () () F 3 6S F 4 1 / 2 = ? 1 / 2 = . The microwave interrogation was applied either in one or two pulses methods. The system could be also locked in a commercial standard to perform its stability evaluation. The first results showed a stability of 11 1 / 2 9 10 - - × t , promising for such use of simple type of frequency standard.
Published in:	Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting August 29 - 31, 2005 Vancouver, Canada
Pages:	288 - 291
Cite this article:	Müller, Stella Torres, Magalhães, Daniel Varela, Bebeachibuli, Aida, Santos, Mônica Silva, Bagnato, Vanderlei Salvador, "Demonstration and Observation of a Frequency Standard Based on an Expanding Cold Atoms Cloud of Cesium," Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting, Vancouver, Canada, August 2005, pp. 288-291.
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