Three-Dimensional Laser Cooling of Helium Beyond the Single-Photon Recoil Limit

Autor:	Michèle Leduc, B. Saubamea, N. Bigelow, Claude Cohen-Tannoudji, John Lawall, S. Kulin
Rok vydání:	1995
Předmět:	Physics education.field_of_study Photon Computer Science::Information Retrieval Population General Physics and Astronomy chemistry.chemical_element Recoil temperature Laser law.invention Recoil chemistry law Laser cooling Metastability Physics::Atomic Physics Atomic physics education Helium
Zdroj:	Physical Review Letters. 75:4194-4197
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.75.4194
Popis:	We report the first observation of subrecoil laser cooling in three dimensions, where we use the method of velocity-selective coherent population trapping. We have cooled a cloud of trapped metastable helium atoms to 180 nK, 22 times below the single-photon recoil temperature, with an enhancement in the momentum-space density of 16. We find that the efficiency with which the velocity-selective trap is populated can be augmented by Sisyphus-type frictional forces, while the cooling process is accompanied by the diffusion of atoms to states of very high velocity. {copyright} {ital 1995} {ital The} {ital American} {ital Physical} {ital Society}.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c1effa68cfac1ab174f4a70f80fc1c8d https://doi.org/10.1103/physrevlett.75.4194 Zobrazit plný text záznamu