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Physical Review A

Comment on “Large enhancement of four-wave mixing by suppression of photon absorption from electromagnetically induced transparency”

Roberto Buffa, Stefano Cavalieri, Marco V. Tognetti

Published Sep 15, 2005• 4 citations
Publisher

Abstract

In this Comment we deal with a recent study of Ying Wu et al. [Phys. Rev. A 67, 013811 (2003)] on a four-wave mixing process. We show that the authors' claim, that a large enhancement of the generation efficiency can be obtained by suppression of photon absorption from electromagnetically induced transparency, is not correct.
DOI
10.1103/physreva.72.037801

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We analyze a four-wave-mixing (FWM) scheme in a five-level atomic system based on electromagnetically induced transparency (EIT). We show that EIT suppresses both two-photon and three-photon absorptions in the FWM scheme and enables the four-wave mixing to proceed through real, resonant intermediate states without absorption loss. The scheme results in a several orders of magnitude increase in the FWM efficiency in comparison with a recent scheme [Phys. Rev. Lett. 88, 143902 (2002)] and may be used for generating short-wavelength radiation at low pump intensities.
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