%0 Journal Article
%J Laser Physics
%D 1999
%T Quantum interference and quantum-Zeno effect in amplification without inversion
%A J. Mompart
%A V. Ahufinger
%A F. Silva
%A R. Corbalán
%A R. Vilaseca
%X We analyze amplification without inversion (AWI) in different homogeneously broadened closed three-level systems in the framework of both density-matrix and quantum-jump formalisms. With the density-matrix formalism we study the nature of quantum interference in these systems; determine analytically the condition for AWI and locate the position of maxima and minima in the probe absorption spectrum. Within the quantum-jump formalism we calculate the relative probabilities of the various physical processes responsible for probe field amplification and absorption, and analyze the role of the quantum-Zeno effect in AWI. The result is that AWI in the h and p schemes is due to one-photon processes while for V and Lambda schemes are due to two-photon processes. We also show that AWI in V and h schemes always occurs in the quantum-Zeno regime, while this regime is not necessary for AWI in the Lambda and p schemes.
%B Laser Physics
%I {INTERPERIODICA}
%C {PO BOX 1831, BIRMINGHAM, AL 35201-1831 USA}
%V 9
%P 844-857
%8 JUL-AUG