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We examine spectral signatures of Rydberg atoms driven with near-resonantdual-tone radio-frequency (RF) fields in the regime of strong driving. Weexperimentally demonstrate and theoretically model a variety of nonlinear andmultiphoton phenomena in the atomic Rydberg response that manifest in the EITspectra. Our results echo previous studies of two-level atoms driven withbichromatic optical fields. In comparison to the optical studies, the RF-drivenRydberg system utilizes a more complex excitation pathway, and electromagneticfields from two different spectral regimes: a two-photon optical excitationcontinuously creates highly excited Rydberg atoms, while RF fields driveresonant coupling between the Rydberg levels and generate strong mixing. Yet,our spectra reflect nearly identical effects of the dual-tone RF fields on theatomic Rydberg observables, showing detuning-dependent splittings and Rabifrequency dependent peak numbers and relative strengths, and avoided crossingsat subharmonic resonances. We thus validate previous two-state models in thismore complex physical system. In the context of Rydberg electrometry, we usethese investigations to explore a technique where we tune a known RF field toobserve spectra which give frequency and power of an unknown RF field using thecomplex dual-tone spectra.

EIT spectra of Rydberg atoms dressed with dual-tone radio-frequency fields