Changing of LiNbO3 Raman spectra under external electric field applying

The results of investigating the effect of an external electric field on the Raman spectrum of the Y-cut of a lithium niobate single crystal are presented. A change in the intensity and position of individual lines of the Raman spectrum that is associated with a change in the parameters of the crystal lattice due to the reverse piezoelectric effect is found. A change in the intensity and a shift in the spectral lines caused by local inhomogeneities of the lithium niobate single crystal have been also observed. In order to determine what contribution each of these effects makes to the change in the Raman spectra, the principal components analysis has been used in the analysis of experimental data.