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Coherence-controlled transparency and far-from-degenerate parametric gain in a strongly absorbing Doppler-broadened medium

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Abstract

An inversionless gain of anti-Stokes radiation above the oscillation threshold in an optically dense far-from-degenerate double-Λ Doppler-broadened medium accompanied by Stokes gain is predicted. The outcomes are illustrated with numerical simulations applied to sodium dimer vapor. Optical switching from absorption to gain via transparency controlled by a small variation of the medium and of the driving radiation parameters, which are at a level of less than one photon per molecule, is shown.

© 2000 Optical Society of America

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