Atom in a partially polarized external field. 2. Multiphoton resonance

M. Ya. Agre, Л. П. Рапопорт

G. A. Delone, Nikolai B. Delone, G. K. Piskova

Philip George Burke

Viktor A Kovarskii, O. B. Prepelitsa

The influence of fluctuations of a polar ambient medium on multiphoton resonances in dipole molecules interacting with an external electromagnetic field is studied. It is shown that the electric fields created by the fluctuating dipole moments of the medium strongly influence the fulfillment of the multiphoton resonance conditions. Cases of slow and fast fluctuations of the polar ambient medium are considered separately. It is established that the temperature dependence of the multiphoton resonance probability is non-Arrhenius because of the influence of the fluctuations on the profile of the potential barrier. For fast fluctuations it is predicted that the rate of the multiphoton transition will decrease as the intensity of the fluctuations of the polar ambient medium increases.

Young-Tak Chough, Hyunchul Nha, Kyungwon An

We review a non-resonant Jaynes-Cummings system where the two-state atom is driven by an external field of arbitrary frequency. We identify the multiphoton resonances in the Jaynes-Cummings Ladder (JCL) system, and thereby explain all the “resonance” peaks at far-off resonant frequencies.

Nikolai B. Delone, В. П. Крайнов

Some typical resonance nonlinear-optics phenomena taking place when light interacts with atoms are considered. The multitude of such phenomena reduces to scattering of the perturbing light, perturbation of the atomic spectrum, excitation of an atom and its ionization. In all these cases the investigations are carried out using the simplest model—an isolated atom in a monochromatic external field. Such a model enables one to give an exact description of many elementary processes. On the other hand it is sufficiently realistic. A detailed investigation is carried out of resonance fluorescence, spontaneous Raman scattering, multiphoton excitation of atoms, resonance shifts and splitting of atomic levels and resonance lonication of atoms. The nature of these processes is investigated as a function of the intensity of the external field, its frequency, a specific atomic spectrum, the nature of polarization of the perturbing field, and the degree of its nonlinearity. The role played by the field of the electromagnetic vacuum is analyzed. Theoretical predictions are compared with the results of many experiments describing resonance processes of the interaction of an intense light field with atoms.