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The angular-distribution parameters of the photoinduced scattering of light at a wavelength of 476.5 nm are used to determine the photovoltaic and diffusion field in nominally pure single crystals of stoichiometric composition (R Li∕Nb 1), grown from the melt with 58.6 mol% LiO 2 (LiNbO 3 stoich.), in nominally pure single crystals of congruent composition (LiNbO 3 ) in congruent single crystals doped with Cu 2 , Zn 2 , Gd 3 , Y 3 , Er 3 , B 3 , (Cu 2 Gd 3 ), and (Ta 5 Mg 2 ). The photoinduced variations of the refractive index of the crystals are determined.