Abstract
The results of our investigations of different kinds of defects in lithium niobate crystals are summarized in this report. Randomly distributed intrinsic point imperfections are dominating in conventional congruent crystals. This leads to a perturbation of the surroundings of optically or acoustically active impurities and to a broadening of their spectral lines. The great narrowing of resonance lines in nearly stoichiometric samples increases the spectral resolution sufficiently to allow the study of even non-controlled trace impurities and satellite centers, consisting of the impurity and intrinsic defects. The disappearance of satellite centers and the appearance of new centers due to the change of charge compensation mechanism was discovered in stoichiometric crystals. The quantitative characterization of the degree of crystal perfection, a definition of regularly ordered crystal and the necessity of the re-investigation of physical properties for perfect samples are discussed.
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