Steady-State and Dynamical Behavior of a Coherently - Three-Level Laser System and Optical Properties of Quantum Confined Systems.

Babak Parvin

Shangqing Gong

We, using a nonlinear theory of laser physics, investigate for a simple three-level atomic system the steady-state intensity behavior due to the effects of quantum coherence and decoherence. We find that the steady-state intensity of the laser field can arrive at a maximal value for a certain Rabi frequency of the driving field. We also find that the linear gain and the laser intensity tend to decrease for the linewidth of the driving field.

R. G. Harrison, W. Forysiak, J. V. Moloney

Mihai Macovei, Jörg Evers, Christoph H. Keitel

We investigate control schemes for the dynamics of a collection of dipole-interacting three-level atoms in $\mathrm{V}$- or $\mathrm{\ensuremath{\Lambda}}$- configuration. For this, we discuss the strong-field steady-state behavior of these systems under the influence of external parameters such as the relative phase between the two applied strong driving laser fields, the ratio of spontaneous decay and incoherent pumping rates, the splitting frequency between closely spaced atomic states, or a surrounding thermal bath. We show that these may act as convenient tools to sensitively control the collective dynamics of the atoms. As applications, we analyze the fluorescence and absorption properties of the atomic samples. Finally, we discuss the transient behavior to show that the presented schemes feature a rapid system evolution as required for many applications.

I. R. Senitzky, Jan Genossar

The behavior of a large number of coherently pumped three-level systems coupled to two resonant cavity modes at the two respective intermediate frequencies is shown to be qualitatively different from conventional laser-type behavior. The existence of three steady states and the dependence of their stability on the operating conditions allows the production of steady, modulated, or pulsed excitation of both modes.

W. Forysiak