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Journal of the Optical Society of America B

Electromagnetically induced transparency and nonlinear pulse propagation in an atomic medium confined in a waveguide

Liang Li, Chengjie Zhu, L. Deng, Guoxiang Huang

Published Dec 19, 2012• 3 citations
Publisher

Abstract

We study electromagnetically induced transparency (EIT) and nonlinear pulse propagation in a resonant atomic gas confined in a microwaveguide. We find that the quantum-interference effect in this system can be greatly enhanced due to the reduction of the mode volume of the optical field. In particular, compared with atomic gases in free space, the EIT transparency window in the present confined system can be much wider and deeper, the group velocity of the probe field can be much slower, and the Kerr nonlinearity of the system can be much stronger. We show that a more efficient production of ultraslow optical solitons in the present system may be achieved with much slower propagating velocity and lower generation power. Features of EIT and pulse propagation in the present system are very promising for practical applications in optical information processing and transmission.

DOI
10.1364/josab.30.000197

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XXX waves are a special type of wave packet that can maintain their transverse profile of XXX shape during propagation, and they are of much interest for the study of fundamental physics and practical applications. Here we present a scheme to generate nonlinear XXX waves and realize their active control by using a cold gas of Rydberg atoms via electromagnetically induced transparency (EIT). We show that, due to the EIT effect contributed by a control laser field and the strong, nonlocal Kerr nonlinearity contributed by Rydberg-Rydberg interaction between atoms, the system supports high-dimensional, nonlocal, and nonlinear optical XXX waves, which have low propagation loss, ultraslow propagation velocity, and ultralow generation power. We also show that the stability domain of such XXX waves can be greatly enlarged by increasing the nonlocality degree of the Kerr nonlinearity, and their motion trajectory can be manipulated by using an external magnetic field. Our study opens a route for generating and controlling nonlocal ultraslow nonlinear optical XXX waves, which may have promising applications in optical information processing and transmission.
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