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All-optical switching at ultralow light levels

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Abstract

We report an experimental demonstration of all-optical switching at ultralow light levels in coherently prepared Rb atoms. A signal light pulse is switched on and off by a control light pulse at different frequencies in a four-level atomic system based on multiphoton interferences. We observed a switching efficiency of 55% with the signal and control light pulses containing 20 photons each, corresponding to a control energy density of 105 photons per atomic cross section λ2(2π).

© 2007 Optical Society of America

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