Abstract

Effects of the antirotating coupling on the absorption resonances arepresented for a microwave driven three-level system. It is shown thatnonlinear sideband generation, selective suppression and switching betweenpeaks and dips in the absorption spectrum are obtained as the microwave Rabifrequency is varied. A physical explanation is given in terms of thecoherent superposition of an infinite set of transitions that are associatedwith an infinite set of dressed states, which are created by the rotatingand nonrotating couplings as the equivalent bichromatic excitation.

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