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Type: Artigo de periódico
Title: Two-photon cooling of magnesium atoms
Author: Malossi, N
Damkjaer, S
Hansen, PL
Jacobsen, LB
Kindt, L
Sauge, S
Thomsen, JW
Cruz, FC
Allegrini, M
Arimondo, E
Abstract: A two-photon mechanism for cooling atoms below the Doppler temperature is analyzed. We consider the magnesium ladder system (3s(2))S-1(0)->(3s3p)P-1(1) at 285.2 nm followed by the (3s3p)P-1(1)->(3s3d)D-1(2) transition at 880.7 nm. For the ladder system quantum coherence effects may become important. Combined with the basic two-level Doppler cooling process this allows for reduction of the atomic sample temperature by more than a factor of 10 over a broad frequency range. First experimental evidence for the two-photon cooling process is presented and compared to model calculations. Agreement between theory and experiment is excellent. In addition, by properly choosing the Rabi frequencies of the two optical transitions a velocity independent atomic dark state is observed.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevA.72.051403
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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