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Two optical methods for determination of the composition in lithium tantalate were discussed. Quantitative relationships between the line width of Raman peaks (142cm −1 for E phonon and 861cm −1 for A 1 phonon) and the crystal composition were firstly presented. The comparison of the Raman data obtained for the congruent and the near-stoichiometric crystals reveals some differences...
The domain walls of periodically poled lithium niobate (PPLN) crystals were investigated using Raman spectrum mapping. The periodical changes of Raman shift in several Raman lines along the period of PPLN have been found. The experimental results show that the domain reversal has different degree of affection on its two neighbor regions, which is related to the asymmetry of crystal lattice. This phenomenon...
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