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Nonlinear Optics

Coherence-controlled optical switching and amplification without inversion in a strongly-absorbing inhomogeneously-broadened medium

A. K. Popov, S. A. Myslivets, Thomas F. George

Published Jan 1, 2004• 0 citations
Publisher

Abstract

A sample, opaque at an inhomogeneously-broadened transition, can be made transparent or even strongly amplifying without inversion by two control lower-frequency lasers. Applications for frequency-tunable filtering, photon switching and amplification in Raman schemes are discussed.
DOI
10.1364/nlo.2004.wd28

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Specific features of nonlinear interference processes at quantum transitions in near- and fully resonant Doppler-broadened optically dense media are studied. The possibility of all-optical switching of the medium to opaque or, alternatively, to absolutely transparent, or even to strongly amplifying states is explored, which is controlled by a small variation of two driving or probe radiations and does not require any change of the level populations. Optimum conditions for inversionless amplification of short-wavelength radiation above the oscillation threshold at the expense of the longer-wavelength control fields are investigated. The feasibility of overcoming the fundamental limitation on a velocity-interval of resonantly coupled molecules imposed by the Doppler effect is shown, based on quantum coherence.
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