Stoichiometry dependence of the electrooptic response of Lithium Niobate

Abstract

We investigated the electrooptic response of a set of Lithium Niobate crystals with Li concentration ranging from off-congruent to stoichiometric. Two accurate techniques based on interferometry and ellipsometry were employed to measure the electrooptic coefficients. No evidence was found of a possible enhancement of the EO response in stoichiometric Lithium Niobate with respect to the congruent one. The EO response showed a weak dispersion in the wavelength range 532-1550 nm