Two-photon cooling of magnesium atoms
- Niels Bohr Institute, Universitetsparken 5, 2100 Copenhagen (Denmark)
A two-photon mechanism for cooling atoms below the Doppler temperature is analyzed. We consider the magnesium ladder system (3s{sup 2}){sup 1}S{sub 0}{yields}(3s3p){sup 1}P{sub 1} at 285.2 nm followed by the (3s3p){sup 1}P{sub 1}{yields}(3s3d){sup 1}D{sub 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.
- OSTI ID:
- 20786427
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 72; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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