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Journal of Modern Optics

Correlated emission lasing in a four-level atomic system in the double-Lambda configuration

Nadeem A. Ansari

Published Jan 1, 1996• 0 citations
Publisher
DOI
10.1080/095003496155508

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Quantum mechanical theory of a non-degenerate correlated emission laser in a four-level atomic system in the double-Λ configuration is presented. It is shown that the mode coupling gains in this model have a phase-sensitive nature so that the spontaneous emission events in the two modes are highly correlated in such a way that the relative phase diffusion coefficient can vanish under certain conditions. Also, because of mode coupling and for a certain range of atomic population in the upper atomic levels, lasing without inversion and correlated emission take place simultaneously. Stability conditions and the steady-state modal ratio are derived and it is shown that this ratio remains stable and for this stationary value of the modal ratio both the modes amplify with equal gains.
We present a dressed-atom theory of a four-level, double-\ensuremath{\Lambda} atomic configruation interacting with a strong laser light which induces a superposition of two lower states. The presence of the cavity and of damping is fully taken into account and the conditions and characteristics of a possible lasing without inversion between the unperturbed states are determined analytically. The special case of the Zeeman-degenerate J=1 lower state is found to be particularly attractive for a possible practical realization.