Abstract
This paper compares two methods of research of nonlinear optical phenomenon in lithium niobate (LiNbO3) crystals. Photorefractive effect is studied by direct and fractal analysis of photoinduced light scattering (PILS) patterns appearing in LiNbO3:Zn (0.018–0.88 wt%) crystals and round scattering appearing in LiNbO3:Zn (2.05 wt%) under laser radiation. Fractal analysis of PILS patterns has been established to be a source of more precise information about laser-induced defects causing PILS and thus, on LN crystals properties. Fractal analysis is able to show dynamics of laser-induced defect distribution in time under action of a laser radiation, while direct analysis of PILS patterns shows only static properties of LN crystals.
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