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Quantum Information and Measurement (QIM)

Spatial Interference of light: a method to generate structured environments to study quantum dynamics

Juan-Rafael Álvarez, Jefferson Flórez, Omar Calderón-Losada, Luis José Salazar-Serrano, Alejandra Valencia

Published Jan 1, 2017• 0 citations
Publisher

Abstract

We observe spatial interference between two parallel-propagating Gaussian beams separated by an arbitrary distance. This constitutes a method for spatial intensity shaping of light beams, which permit to structure environments to study different quantum dynamics.
DOI
10.1364/qim.2017.qt6a.27

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Beam propagation beyond the paraxial approximation is studied in an optically written waveguide structure. The waveguide structure, which leads to diffractionless light propagation, is imprinted on a medium consisting of a five-level atomic vapor driven by an incoherent pump and two coherent spatially dependent control and plane-wave fields. We first study beam propagation in a single optically written waveguide and find that the paraxial approximation does not provide an accurate description of the probe propagation. We then employ coherent control fields such that two parallel and one tilted Gaussian beams produce a branched waveguide structure. The tilted beam allows selective steering of the probe beam into different branches of the waveguide structure. The transmission of the probe beam for a particular branch can be improved by changing the width of the titled Gaussian control beam as well as the intensity of the spatially dependent incoherent pump field.