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Journal of Modern Optics

Restoring dark lines in spontaneous emission via Fano interference

Emmanuel Paspalakis, P. L. Knight

Published Mar 1, 1999• 6 citations
Publisher

Abstract

We investigate the effects of spontaneous emission on two different laser-driven autoionization systems. We find that, under specific conditions, the relaxation decay processes can interfere destructively and lead to dark lines and spectral narrowing in the spontaneous emission spectra of these systems.
DOI
10.1080/09500349908231289

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Interference effects between decay processes from two upper levels, which are coupled by the same vacuum modes to a lower level and are driven by a strong coherent field, on the spontaneous emission spectrum have been studied. The interference could lead to population trapping in the upper levels, two dark lines in the spectrum and spectral narrowing. The spectral narrowing depends on the ratio of the two upper levels' decay rates and the Rabi frequency of the driving field. One can change the spectrum by varying the Rabi frequency, an experimentally controllable parameter.