The electro-optic and dielectric properties of organic–inorganic 2-amino-5-nitropyridium dihydrogen phosphate crystals were measured near room temperature at a wavelength of 632.8 nm and as a function of an electric-field frequency that varied from 1 kHz to 40 MHz. The frequency dispersion of the electro-optic coefficients and their comparison with the second-harmonic generation coefficients showed that the largest part of the electro-optic properties is electronic in origin (whereas the piezo-optic contribution is small). Results reveal a large anisotropy of the ionic and electronic contributions that is related to the contributions of the organic molecule to nonlinear polarizability.
© 2000 Optical Society of America
J. Zaccaro, J. P. Salvestrini, A. Ibanez, P. Ney, and M. D. Fontana, "Electric-field frequency dependence of Pockels coefficients in 2-amino-5-nitropyridium dihydrogen phosphate organic–inorganic crystals," J. Opt. Soc. Am. B 17, 427-432 (2000)