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
K. Sutter, J. Hulliger, R. Schlesser, and P. Günter, "Photorefractive properties of 4′-nitrobenzylidene-3-acetamino-4-methoxyaniline," Opt. Lett. 18, 778-780 (1993)