We show analytically and numerically that the application, during the storage time, of an additional weak field connecting the lower levels (LLs) of a Lambda system can modify the spin coherence and the amplitude of the retrieved probe without causing distortion. The LL coupling field adds an additional phase-dependent term to the probe propagation equation. The retrieved probe is amplified when the total relative phase Phi=0 or pi and decreased when Phi=pi/2.

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Efficient images storage via modulating the atomic spin coherence in a N-type system

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Chinese Physics B

Dynamic control of retrieval contrast in a Λ-type atomic system

Xiaohang Zhang, Qian-Qian Bao, Yan Zhang, Ming-Che Su, Cui-Li Cui, Jin‐Hui Wu

Published May 1, 2012• 3 citations

Publisher

Abstract

DOI: 10.1088/1674-1056/21/5/054209

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(<25)

, while at higher optical depths the experimental efficiency falls below the theoretically predicted values. We identify possible effects responsible for this reduction in memory efficiency.