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Latin America Optics and Photonics Conference

Development of a Mobile Atomic Frequency Standard based on Cold Atoms

Stella Müller, Felipe Arduini Otoboni, Jair de Martin, Rodrigo Duarte Pechoneri, Vanderlei Salvador Bagnato, Daniel Varela Magalhães

Published Jan 1, 2012• 3 citations
Publisher

Abstract

We have been developing a compact frequency standard based on cold cesium atoms. The atoms are cooled, interrogated during a free expansion and then detected inside a cylindrical microwave cavity. The operation of this experiment is different from conventional cold atoms fountains, since all the steps are sequentially performed in the same place.

DOI
10.1364/laop.2012.lm2a.12

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We have been developing a compact frequency standard based on cold cesium atoms. The atoms are cooled, interrogated during a free expansion and then detected inside a cylindrical microwave cavity. The operation of this experiment is different from conventional cold atoms fountains, since all the steps are sequentially performed in the same place.
We have demonstrated the possibility for a compact frequency standard based on a sample of cold cesium atoms. In a cylindrical microwave cavity, the atoms are cooled and interrogated during a free expansion and then detected. The operation of this experiment is different from conventional atomic fountains, since all the steps are sequentially performed in the same position of space. In this paper we report the analysis of a Ramsey pattern observed to present a 47 Hz linewidth and a stability of 5x10^-13 for an integration time longer than 100s. Some of the main limitations of the standard are analyzed. This present report demonstrates considerable improvement of our previous work (S. T. Muller et al, J. Opt. Soc. Am. B, v.25, p.909, 2008) where the atoms were in a free space and not inside a microwave cavity.
We have demonstrated the possibility for a compact frequency standard based on a sample of cold cesium atoms. In a cylindrical microwave cavity, the atoms are cooled and interrogated during a free expansion and then detected. The operation of this experiment is different from conventional atomic fountains since all the steps are sequentially performed in the same position of space. In this paper we report the analysis of a Ramsey pattern observed to present a (47±5) Hz linewidth and a stability of (5±0.5)x10−13τ−1/2 for an integration time longer than 100 s. Some of the main limitations of the standard are analyzed. This present report demonstrates considerable improvement of our previous work [J. Opt. Soc. Am. B25, 909 (2008)JOBPDE0740-322410.1364/JOSAB.25.000909] where the atoms were in a free space and not inside a microwave cavity.
The compact frequency standard under development at USP Sao Carlos is a cold atoms system that works with a distributed hardware system principle and temporal configuration of the interrogation method of the atomic sample, in which the different operation steps happen in one place: inside the microwave cavity. This type of operation allows us to design a standard much more compact than a conventional one, where different interactions occur in the same region of the apparatus. In this sense, it is necessary to redefine all the instrumentation associated with the experiment. This work gives an overview of the topology we are adopting for the new system.
The compact frequency standard under development at USP Sao Carlos is a cold atoms system that works with a distributed hardware system principle and temporal configuration of the interrogation method of the atomic sample, in which the different operation steps happen in one place: inside the microwave cavity. This type of operation allows us to design a standard much more compact than a conventional one, where different interactions occur in the same region of the apparatus. In this sense, it is necessary to redefine all the instrumentation associated with the experiment. This work gives an overview of the topology we are adopting for the new system.