Raman Spectral of Ce/Mn Co-Doped LiNbO<sub>3</sub> Crystal

Abstract

Ce:Mn:LiNbO3 single crystals with different [L/[N were used for the measurement of Raman spectrum. Each peak appeared in the Raman spectrum was ascribed to the basic vibration modes of the LiNbO3 crystal according to the basic analysis and the achievements obtained by the earlier researches. The results showed that the peak width at half height (FWHM) of the A1(TO1) vibration mode become wide gradually with the increase of the [L/[N. However, the FWHM of A1(TO2) and A1(TO4) vibration mode decrease with the increase of the [L/[N in the crystal. The FWHM of the E(TO1) vibration mode was decrease with the increase of [L/[N in the crystal, and also the linear relationship between the FWHM of the E(TO1) vibration mode and the [L/[N in the crystal. According to the relationship between the [L/[N in the crystal and the FWHM of the E(TO1) vibration mode for the pure LiNbO3 crystal, the quantitative relation for the Ce/Mn co-doped LiNbO3 crystal was revealed by amending the empirical formula for pure LiNbO3 crystal on the basis of the results measured by ICP-AES. The quantitative relation of the FWHM of the E(TO1) vibration mode and the [L/[N was given by the Polynomial Fit of the experimental data.