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Journal of Physics Conference Series

Correlated Signals of Free Induction Decay in CdSe–CdS Nanostructures Under Two- and Three-Photon Excitation by Crossed Femtosecond Laser Beams

В. В. Самарцев, Tatiana G. Mitrofanova

Published Apr 1, 2018• 0 citations
Publisher

Abstract

The possibility and conditions of a generation of the correlated free induction decay signals in CdSe–CdS nanostructures under two- and three-photon excitation by crossed femtosecond beams of the Ti:sapphire laser radiation are considered. It is shown that these correlated signals will be emitted in two opposite directions. The information contained in the temporal shapes and wavefronts of these signals will be correlated.

DOI
10.1088/1742-6596/999/1/012014

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The possibility and conditions of a generation of the correlated free induction decay signals in CdSe–CdS nanostructures under two- and three-photon excitation by crossed femtosecond beams of the Ti:sapphire laser radiation are considered. It is shown that these correlated signals will be emitted in two opposite directions. The information contained in the temporal shapes and wavefronts of these signals will be correlated.
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Entangled free induction decay (EFID) femtosecond signals are experimentally observed for the first time at a wavelength of 790 nm in a cadmium sulfide (CdS) crystal in the two-photon absorption (TPA) regime upon excitation by two crossed (angle, 60°) laser beams. The sample emitted two EFID signals simultaneously in opposite directions. The signals were diffracted by nonequilibrium electric polarization gratings induced by two laser beams in accordance with the laws of energy and momentum conservation. The possibility of exciting EFID signals in the three-photon absorption regime is discussed.