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Optics and Spectroscopy

Effect of relaxation on the cooperative-radiation dynamics of an extended system

R. F. Malikov, В. А. Малышев, Evgenii Dmitrievich Trifonov

Published Oct 1, 1982• 2 citations
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Temperature dependent properties of the dynamics of a two-level system interacting with a radiation field

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Physica A Statistical Mechanics and its Applications•Jun 1, 1978•3 citations
Numerical researches of the three-level atomic system on supervision of pulse and spectrum dynamics of superfluorescence are carried out at incoherent pumping depending on nonradiation relaxations, on influence of phase relaxations are shown. Pulse and spectrum dynamics of induced superradiation depending on the area and duration of input pulse at incoherent pumping, with and without taking into account phase relaxations, are investigated. Depending on media parameters different modes of induced superradiation are researched.
We study effects of direct interatomic interaction on cooperative processes in atom-photon dynamics. Using a model of two-level atoms with Ising-type interaction as an example, it is demonstrated that interparticle interaction can promote cooperative radiative relaxation. For small number of atoms this results in inhibition of incoherent spontaneous decay leading to the regime of collective pulse relaxation. Above superradiance threshold increase in delay time and enhancement of superradiance is occurred. In the case of strong interaction (as compared to excitation energy of an atom) transition to the regime of multiphoton relaxation occurs, which we discuss using a simple model of two atoms in a high-Q single mode cavity. It is shown that such transition is accompanied by Rabi oscillations involving many-atom multiphoton states. Dephasing effect of dipole-dipole interaction and solitonic mechanism of relaxation are discussed as well.
Cooperative radiation emitted by an ensemble of three-level optical systems with a doublet in the ground state (Λ scheme), which is placed into a cyclic cavity, is studied theoretically. In contrast to the two-level model of emitters, this process with such a configuration of operating transitions may occur without population inversion in the whole, if the doublet is prepared at the initial instant in a superposition (coherent) state. In the ideal case of a Hamilton system, in which the cavity losses and relaxation in the radiator ensemble are disregarded, the conservation laws are derived, which allow a substantial reduction of the dimension of the phase space of the model (ℝ 11 → ℝ 5 ) and the application of methods of dynamics of nonlinear systems for analyzing the three-level superradiance under these conditions. The possibility of different (both quasiperiodic and chaotic) scenarios of the three-level superradiance is demonstrated on the basis of Poincaré’s mappings. Global bifurcation of the system upon a transition from the conventional superradiance regime to inversionless one is revealed. The effects of cavity losses, as well as homogeneous and inhomogeneous broadening in the system of radiators on the regularities found are also discussed.