A comparative study of two types of optically controlled structures with a modulating liquid-crystal layer and antimonite (Sb2S3) or arsenic selenide (As<sub>40</sub>Se<sub>60</sub>) as the photoconductor has been carried out. It is shown that diffraction efficiency up to 42% was able to be obtained in the reversible thin-hologram recording regime, while the use of a photoconductor layer whose maximum spectral sensitivity is close to the radiation wavelength of a He-Ne laser provided sensitivity of 0.75 µW/cm<sup>2</sup> at a recording wavelength of lambda=633nm. The structures considered here are characterized by the presence of a decreasing section of the modulation response, with a falloff of the diffraction efficiency to 0.05 epsilon<sub>max</sub> (for an Sb2S3 photoconductor layer) and 0.01 epsilon<sub>max</sub> (for an As<sub>40</sub>Se<sub>60</sub> photoconductor layer), because of which they can be used in holographic correlation systems for implementing nonlinear information-processing algorithms. © 2005 Optical Society of America

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