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Journal of Modern Optics

Controlling the spontaneous emission via quantum interference of incoherent pumping field

Mostafa Sahrai, Reza Hemmati, H. Tajalli, Mohammad Mahmoudi

Published Nov 30, 2007• 5 citations
Publisher

Abstract

We study the effects of quantum interference from the spontaneous emission and the incoherent pumping field on the population trapping and the spontaneous emission spectrum. It is shown that in a four-level atomic system with both interferences, the population will be trapped in degenerate two upper levels. We find that the spontaneous emission properties of the atom can be significantly modified by the interference of incoherent pumping field.

DOI
10.1080/09500340701289163

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We study the effects of quantum interference from the spontaneous emission and the incoherent pumping field on the population trapping and the spontaneous emission spectrum. It is shown that in a four-level atomic system with both interferences, the population will be trapped in degenerate two upper levels. We find that the spontaneous emission properties of the atom can be significantly modified by the interference of incoherent pumping field.
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We investigate the steady-state spontaneous emission of a V-type three-level atom, with the coherence between the two upper levels modified and controlled via incoherent pumping to a fourth auxiliary level. The external pumping gives us an easily controllable handle in manipulating the spontaneous emission to such an extent that, under certain conditions, complete quenching of spontaneous emission is possible. We also show that even the interference between the decay channels, which is considered a key requirement in spontaneous emission quenching through quantum interference, is not essential to achieve near 100% trapping and almost complete suppression of spontaneous emission. Thus we provide a scheme for spontaneous emission quenching which can be easily realized experimentally.
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The quantum interference in the spontaneous-emission spectrum of a driven atom, when the upper level of the atomic transition is coupled to a third level via a classical driving field, results in a dark line in the absence of the atomic decays. The existence of the dark line is independent of the Rabi frequency associated with the driving field. There is no such dark line in the spontaneous-emission spectrum when, instead of the upper level, the lower level is coupled to a third level via a driving field. In this paper, we include the level decays, incoherent pumping, and the finite bandwidth of the driving field in our analysis and study their role in the spontaneous-emission spectrum in the two configurations.