Abstract
We investigate spectroscopic properties of cold 85Rb atoms in a magneto-optic trap. Both the transmission and the reflection spectra of the trapped atoms are recorded. The dressed-atom picture and the density-matrix formalism are appropriately used to explain the absorption profile around the F=3-F′=2,3,4 and F=2-F′=1 transitions. Around the trapping laser frequency, phaseconjugation signals are observed (reflectivity is about 10 −4), which are attributed to the degenerate and nearly-degenerate four-wave mixing.
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