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Frontiers in Optics

Electromagnetically-Induced Phase Grating

Luı́s E. E. de Araujo

Published Jan 1, 2010• 0 citations
Publisher

Abstract

An atomic phase grating, based on the giant Kerr nonlinearity under electromagnetically induced transparency, is described. The grating is highly efficient and diffracts close to 30% of a probe beam into the first diffraction order.
DOI
10.1364/fio.2010.fwz4

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We propose a scheme for realizing electromagnetically induced grating via the giant Kerr nonlinearity in a coherently driven four-level system with spontaneously generated coherence. In the presence of spontaneously generated coherence, Kerr nonlinearity can be enhanced with vanishing linear absorption. Thus, with a standing-wave coupling field, one can achieve a pure absorption grating, which leads the probe field to gather the zero-order direction when the detuning of the coupling field is on resonance. Moreover, we can obtain a pure phase grating, which diffracts a weak probe light into the first-order direction and the second-order direction when the detuning of the coupling field is off resonance.