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Princeton University Press eBooks

8. Three-Level Atoms: Applications to Nonlinear Spectroscopy—Open Quantum Systems

P. R. Berman, Vladimir S. Malinovsky

Published Dec 31, 2011• 0 citations
Publisher
DOI
10.1515/9781400837045-009

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A technique of differential intracavity phase spectroscopy is introduced. The measured beat frequency between the two counterpropagating fields in a ring laser directly yields the differential phase shift due to the presence of an atomic vapor. In an unstabilized laser cavity, phase differences near ${10}^{\ensuremath{-}6}$ are measured. This technique is used to study the nonlinear dispersion associated with a three-level $\ensuremath{\Lambda}$ system in atomic samarium. Sub-Doppler resonances and population trapping are observed, both of which are attributed to the coherences between the two lower levels of the $\ensuremath{\Lambda}$ level structure. Solutions of the density matrix describing the system are also presented, and good qualitative agreement is found between the calculations and the measurements.