A study of the transition at the Rabi frequency in the driven two level atom

Andrew S. M. Windsor, Changjiang Wei, Scott A. Holmstrom +2 more

The response of a strongly driven Rabi transition, which is associated with a strongly driven two-level atom, is studied. Such a driven Rabi transition exhibits Mollow splitting including gain features, and the Mollow spectrum associated with the original transition is also altered. We demonstrate that driving the Rabi transition produces a new transition at its own Rabi frequency, which can be driven to exhibit further Mollow splitting. Our experimental results are in good agreement with theory based on doubly dressed states.

Bryan J. Dalton, M. J. Gagen

А. В. Леонов, И. Д. Феранчук

Bryan J. Dalton, M. J. Gagen

Calculations based on a full master equation approach have been made of the absorption spectrum for a certain three-level system in which two states mod 2), mod 1) are strongly driven by a near resonant monochromatic laser field whose Rabi frequency is large compared with the natural lifetime width of mod 2). A third state mod 3) is coupled to the nearby state mod 2) by a static electric field. As the static field coupling increases the spectrum in the neighbourhood of the laser frequency changes from the partly emissive, partly absorptive Mollow form to an absorptive spectrum with two strong peaks. Also, the spectrum in the neighbourhood of the upper level transition frequency changes from an Autler-Townes doublet to a spectrum where a new emissive line appears at the Rabi frequency. In terms of the dressed atom model, this transition corresponds to an intradoublet transition previously forbidden in two-level atoms, though predicted to occur in certain two-level molecular systems. The spectrum is interpreted in terms of a dressed atom model. In general terms not only do the dressed atom transition frequencies correlate well with the spectral features, but there is also good agreement between the heights and widths of the spectral features and those obtained from the full master equation approach. The importance of using the full dipole operator in the basic definitions of the spectral quantities is also demonstrated.

Wilhelmus M. Ruyten

Andrew D. Greentree, Changjiang Wei, Scott A. Holmstrom +4 more

A two-level system is driven by two strong fields, one on resonance and one close to resonance. There is a resonance-like response of the coupled atom-field system when the detuning of the second field is an integer fraction of the Rabi frequency of the resonant field. These subharmonic resonances are monitored by a transition to a third level and give a characteristic spectrum dominated by a series of doublets.