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|Title:||Two-photon cooling of magnesium atoms|
Hansen, P. L.
Jacobsen, L. B.
Thomsen, J. W.
Cruz, F. C.
|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.|
Doppler, Efeito de
Termometro e termometria
|Editor:||American Physical Society|
|Citation:||Physical Review A. American Physical Soc, v. 72, n. 5, 2005.|
|Appears in Collections:||IFGW - Artigos e Outros Documentos|
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