Undoped single crystals of the organic electro-optic material 4′-nitrobenzylidene-3-acetamino-4-methoxyaniline were found to show photorefractive effects owing to light-induced charge separation. In two-wave-mixing experiments, beam-coupling gains as high as 2.2 cm^-1 and response times as low as 8 s at writing intensities of 130 mW/cm² were measured at a wavelength λ = 514.5 nm. An analysis of the experimental data shows that the beam-coupling gain is limited by the electro-optic response of the material, while the response time is characterized by a large optical absorption and a low quantum efficiency for carrier generation.

© 1993 Optical Society of America

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