Abstract

We report two-beam coupling experiments at 1.06-μm wavelength using photorefractive semi-insulating GaAs:Cr in the moving-grating recording mode. The steady-state gain coefficient Γ is measured as a function of fringe spacing Λ, fringe velocity υ, applied voltage V₀, and incident beam ratio β. A maximum Γ as high as 6–7 cm⁻¹ is observed for Λ ≃ 18 μm, υ ≃ 1 mm/sec, β > 10³, and V₀ ≃ 5 kV (interelectrode distance 5.8 mm). The agreement with the theory of two-beam coupling with moving fringes is discussed. In particular, a set of numerical values is obtained for some crystal parameters. Image amplification is demonstrated.

© 1988 Optical Society of America

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