Two-photon cooling of magnesium atoms
2005 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 72, no 5Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2005. Vol. 72, no 5
magnetooptical trap, calcium atoms, laser, spectroscopy, temperature
IdentifiersURN: urn:nbn:se:kth:diva-15208ISI: 000233603400014OAI: oai:DiVA.org:kth-15208DiVA: diva2:333249
QC 201005252010-08-052010-08-05Bibliographically approved