Abstract

Phase-conjugate beam reflectivity in photorefractive Bi12SiO20 (BSO) crystals is analyzed as a function of the following parameters involved in the four-wave mixing interaction: grating spatial frequency Λ−1, applied field E0, and incident beam ratio β. We report an amplified reflectivity (R = 2.7) for asymmetric pump-beam intensities and optimized fringe-displacement speed (moving-grating recording mode, E0 = 10 kV cm−1; Λ−1 ≃ 45 mm−1; β > 104). The conjugate-beam reflectivity is shown to depend closely on the same parameters as the exponential gain coefficient Γ of the two-wave mixing configuration. Still higher reflectivities (R′ = 35) are demonstrated by using a combination of two BSO crystals whose roles are, respectively, to generate and then to amplify the conjugate beam.

© 1984 Optical Society of America

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