Coherence and linewidth of a continuously pumped atom laser at finite temperature

Lee, Geoffrey M, Haine, Simon A, Bradley, Ashton S and Davis, Matthew J (2015) Coherence and linewidth of a continuously pumped atom laser at finite temperature. Physical Review A, 92 (1). p. 3605. ISSN 1050-2947

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Abstract

A continuous-wave atom laser formed by the outcoupling of atoms from a trapped Bose-Einstein condensate (BEC) potentially has a range of metrological applications. However, in order for the device to be truly continuous, a mechanism to replenish the atoms in the BEC is required. Here we calculate the temporal coherence properties of a continuously pumped atom laser beam outcoupled from a trapped Bose-Einstein condensate that is replenished from a reservoir at finite temperature. We find that the thermal fluctuations of the condensate can significantly decrease the temporal coherence of the output beam due to atomic interactions between the trapped BEC and the beam, and this can impact the metrological usefulness of the device. We demonstrate that a Raman outcoupling scheme imparting a sufficient momentum kick to the atom laser beam can lead to a significantly reduced linewidth.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Atomic, Molecular and Optical Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Richard Chambers
Date Deposited: 12 Jan 2017 13:36
Last Modified: 06 Mar 2017 08:54
URI: http://sro.sussex.ac.uk/id/eprint/66132

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