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Near-resonant ac-drive acting on a two-level system induces the Rabioscillations of the level occupations. It is shown that additional weak driveproperly frequency-detuned from the primary drive causes a resonant response.This response manifests itself in the emergence of the envelope of theoscillations. At resonance, the inverse period of the envelope is proportionalto the amplitude of the weak drive. The resonant condition reads: difference offrequencies between the two drives is equal to the ac-splitting of quasilevelsin the field of the strong drive. Technically, the resonance can be inferredfrom the analogy between the equations for the time-evolution of the spinamplitude and the Mathieu equation, which describes e.g. the parametricresonance.

Combined effect of mutually frequency-detuned strong and weak drives on a two-level system: Envelope of the Rabi oscillations