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- W2063747184 abstract "Pressure-induced effects in nonlinear optics and spectroscopy are studied using a nonstandard-dressed-atom formalism for a set of two-level atoms. We consider a two-level atom interacting with two radiation fields whose frequencies differ by ensuremath{delta} and undergoing dephasing collisions with a perturber bath. The atom-field detunings are large compared with all relaxation rates in the problem. The system is described by a Hamiltonian of an atom dressed by a single-mode field with a coupling constant slowly varying in time at frequency ensuremath{delta}. We show that the collisionally aided excitation of the initially unpopulated dressed states is modulated in time. All the characteristics of the pressure-induced effects are deduced from the properties of this time-modulated excitation. Apart from already known phenomena (pressure-induced extra resonances in four-wave mixing, pressure-induced phase shifts, etc.) that are reinterpreted using this approach, we present a new effect that can be described as fluorescence beats. Finally, we show that this approach gives a firm basis for use of a model involving collision-induced gratings and we interpret the pressure-induced effects in the context of this model." @default.
- W2063747184 created "2016-06-24" @default.
- W2063747184 creator A5059605086 @default.
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- W2063747184 date "1989-04-01" @default.
- W2063747184 modified "2023-10-16" @default.
- W2063747184 title "Pressure-induced effects in two-level atoms: New approach and simple physical interpretation" @default.
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- W2063747184 doi "https://doi.org/10.1103/physreva.39.4016" @default.
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