2 ATOM-SINGLE MODE RADIATION-FIELD INTERACTION - STATE EVOLUTION, LEVEL OCCUPATION PROBABILITIES AND EMISSION-SPECTRA

An exact solution for the problem of two two-level atoms interacting w ith a single-mode detuned quantized radiation field is presented. On r esonance, an asymptotic result is derived for large coherent initial f ields. It is shown that when the atoms are initially prepared in one o f the semiclassical eigenstates, the atom-plus-field wavefunction rema ins almost factored into an atomic and a field part throughout the int eraction. Under certain conditions, the atomic part evolves into a uni que pure state at half-revival time. The effects of the cavity detunin g on the dynamics of the atomic level occupation probabilities and emi ssion spectra are studied. It is found, for non-symmetrical excitation , that far off-resonance the field acts like a virtual level by means of which the energy is transferred between the atoms. Due to non-zero detuning, nine-peaked spectra are observed and are given a clear expla nation from the dressed-state viewpoint. It is established that in the case of symmetrical excitation, the intensity of the emission spectru m is two times larger than that in the case of non-symmetrical excitat ion.