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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Coherent Raman transition between sublevels of the lower doublet in superradiance without inversion

A. A. Bogdanov, Igor Viktorovich Ryzhov, А. И. Зайцев

Published Jan 14, 2000• 2 citations
Publisher

Abstract

We investigate the influence of the local field on the competition between the operating transitions in the superradiant emission from a thin film comprised of the three-level atoms with the initial coherence of lower doublet. Due tot this influence a coherent Raman transition between the sublevels of a doublet may occur.
DOI
10.1117/12.375332

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Under analysis is the influence of the local field upon the competition of transitions in the process of superradiance from incompletely excited thin layer of three level atoms ((Lambda) -diagram of the operating transitions). It is highlighted that while the upper sublevel of the lower doublet starts degenerating, there is a superradiant regime, where the combinative transition leads the development of the superradiance pulse, and the time of the pulse delay depends on the parameters of the local field and splitting of the lower doublet.
We carry out a theoretical study of the collective spontaneous emission (superradiance) from an ultrathin film comprised of three-level atoms with V configuration of the operating transitions. As the thickness of the system is small compared to the emission wavelength inside the film, the local-field correction to the averaged Maxwell field is relevant. We show that the interplay between the low-frequency quantum coherence within the subspace of the upper doublet states and the local-field correction may drastically affect the branching ratio of the operating transitions. This effect may be used for controlling the emission process by varying the doublet splitting and the amount of low-frequency coherence.