10-1103-PhysRevA-91-013605.pdf (320.75 kB)
Coherence and linewidth of a continuously pumped atom laser at finite temperature
journal contribution
posted on 2023-06-09, 04:39 authored by Geoffrey M Lee, Simon A Haine, Ashton S Bradley, Matthew J DavisA 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.
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Publication status
- Published
File Version
- Published version
Journal
Physical Review AISSN
1050-2947Publisher
American Physical SocietyExternal DOI
Issue
1Volume
92Page range
3605Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Atomic, Molecular and Optical Physics Research Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2017-01-12First Open Access (FOA) Date
2017-01-12First Compliant Deposit (FCD) Date
2017-01-12Usage metrics
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