Raman scattering and non-linear optical properties in Li₂B₄O₇

Abstract

A complete Raman scattering study on a lithium tetraborate single crystal is reported. The frequency and scattered intensity of Raman modes are carefully determined in the various geometrical configurations. These Raman data are then used to relate to the electro-optical and non-linear optical properties. Raman scattering efficiencies of A1(a), A1(b) and E phonons are consistent with the values of the EO coefficients r13, r33 and r51 respectively.

Raman scattering in glassy Li2B4O7 doped with Er2O3

“…The maximum at 1342 cm -1 is indicative of vibrations of borate rings and symmetric stretching of flat BO 3 triangles. The normal vibrations of boron-oxygen bonds B-O [12,15] are responsible for the diffused maxima detected at the frequencies 1648 and 1894 cm -1 . The data on the vibrations identification can be obtained using the analysis of characteristic frequencies known for the other compound ions consisting of boron atoms in the tetrahedral and trigonal environments of oxygen atoms.…”

“…The normal vibrations of ligands with Er 3+ ions in the structural complexes of LTB (see Fig. 1b-d) [12] can also contribute to this region.…”

“…In the recent years, a number of works have been devoted to the studies of vibrational spectra of Li 2 B 4 O 7 [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Except for Refs.…”

“…[17,18], contains eight formula units, i.e. 104 atoms in the primitive unit cell of the space group I4 I cd (C 4v 12 ), and the tetragonal unit-cell dimensions are equal to a = b = 9.477(5) Å and c = 10.290(4) Å. Volumetric boron-oxygen complexes [B4O9]6-consist of two flat triangles [BO3] and two tetrahedrons [BO4] with strong covalent binding [10], which are combined by common neighbouring complexes of oxygen atoms in a helix, with its axis parallel to the c axis. This forms a rigid three-dimensional framework through shared oxygen atoms.…”

Characterization of Barium Borate Frameworks Using Raman Spectroscopy

“…1 The interesting electronic and optical characteristics associated with the formation of divalent lanthanides have often provided many commercial applications. In particular, these materials have found use in several applications ranging from nonlinear optics [2][3][4] to persistent luminophors. 5 Borate-layered frameworks have proven to be interesting hosts for luminescent materials due to their relatively low synthesis temperatures and excellent physical and chemical stabilities.…”