Relative Raman-Intensitäten der Phononen von LiNbO₃ / Relative Raman Intensities of the Phonons of LiNbO₃

Abstract

In the last few years the assignment of the optical phonons of LiNbO

Raman Spectra and Directional Dispersion in LiNbO3 and LiTaO3

“…I n order to eliminate it, the surfaces of specimen were coated with an anti-reflecting film of SiO,, which diminishes the reflection to about 2 %. However, the additional scattering peaks cannot be eliminated completely, T a b l e 1 Raman scattering efficiency in LiNbO, and LiTaO, crystals a t the geometrical configuration shown in Fig.1 configura- 8 ordinary phonon extraordinary phonon tion they are indicated in Fig. 3 by asterisks.…”

Accurate determination of the anisotropy factors and the phase differences of Raman polarizabilities in some uniaxial crystals: the case of lithium niobate

“…Table 2 is a comparison of the optical phonon modes of the present work with those of Nippus [3] and Barker and Loudon [8]. In table 1, we can see that the full width at half-maximum changes with the crystal rotation angle.…”

“…where S(ω): amplitude of the Raman line for a given ω, S max : maximum amplitude of the Raman line [3].…”

“…This is due to the approximation ω ∼ ω 0 . Nippus [3] has used a simplified Lorentz profile to evaluate the parameters (S max , ω 0 , ) and the peak areas. Therefore, with the aim of comparing our results with those of Nippus, we have used equation (3) to evaluate the peak areas.…”

“…Loa et al [2] measured indirectly the tensor elements of the Raman scattering in thin sample films of GaN by measurement of the Raman efficiencies at different distances from the laser focus. Nippus [3] has used the simplified Raman profile to determine peak areas and relative Raman tensor that he then converted to the relative Raman tensor polarizabilities. Strach et al [4] have used both rotations of the polarizers and the analysers to obtain the Raman intensities.…”