Regularities in the transformation of optical coherence in the model three-level system, resulting from instability development and emission of a superradiance pulse, are considered. It is shown that the superradiance eliminates optical coherence on the adjacent optically allowed transitions and induces optical coherence on the optically forbidden transition. This, in turn, makes it possible to observe new effects of photon-echo type, some of which are described in the present paper.
A. M. Basharov, N. V. Znamenskiy
Journal of Physics B: Atomic, Molecular and Optical Physics