Superfluorescence without inversion in coherently driven three-level systems

1999; American Physical Society; Volume: 60; Issue: 2 Linguagem: Inglês

10.1103/physreva.60.1598

ISSN

1538-4446

Autores

В. В. Козлов, Оlga Kocharovskaya, Yuri V. Rostovtsev, Marlan O. Scully,

Tópico(s)

Nonlinear Dynamics and Pattern Formation

Resumo

A superfluorescence effect in a V-type medium with initial Raman inversion, driven by a strong coherent field on one of the transitions, is studied analytically and numerically. It is shown that the collective spontaneous emission evolves in the presence of a minor population of an upper state of a superfluorescent transition. In the limit of the Rabi frequency of a driving field large compared to that of a superfluorescent pulse, the system of two equations for the fields and density-matrix equations for three states of the medium is reduced to Maxwell-Bloch equations for an effective two-level system. The shape of a superfluorescent pulse is perfectly described in terms of a slowly varying envelope function (which is a solution of the Maxwell-Bloch equations), filled with fast oscillations associated with Rabi floppings on the driving transition. In the average, i.e., after integrating over a period of Rabi oscillations, the upper superfluorescent state is populated less than other states, such that the phenomenon may be called ``superfluorescence without inversion'' by analogy with lasing without inversion.

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