Characterization technique of crystalline materials for most efficient their application as active element of electro-optic cell in infocommunication systems
In this work we present the experimental technique suitable for the determination of all the linear electro-optic effect (LEOE) tensor components in crystal materials of any symmetry. We describe in details the sample geometries that are needed to determine a complete set of the LEOE tensor components as well as derive the corresponding equations. It gives a possible to perform the electro-optic characterization for all crystalline materials with aim of most efficient their application as active elements of electro-optic cells for infocommunication systems.
Growth and Optical Properties of LiNbO3: MgO Single Crystals
The technological procedure of the manufacturing of the LiNbO3˙ single crystals doped with 5 mol.% MgO is described in this paper. The results of the investigation of the crystal optical properties, ESR spectra and optical homogeneity are presented. The refractive index dispersion in 300–700 nm region and their temperature dependencies in 20–500 °C range are measured. The dispersion curve is approximated by the two oscillator Sellmeier formula. The data on the LiNbO3: MgO crystal optical resistance are presented.
Electron spin resonance and electron-nuclear double-resonance investigation of a new Cr3+ defect on an Nb site in LiNbO3: Mg:Cr
For LiNbO3 crystals heavily doped with Mg and codoped with Cr a single isotropic ESR line with g=1.971+or-0.002 and a minimal linewidth of 1.8+or-0.2 mT has been observed. With ENDOR it could be shown unambiguously that the new defect is Cr3+ substituting for Nb. The 53Cr hyperfine and quadrupole constants are A/sub ///=50.8+or-0.2 MHz, Aperpendicular to =51.0+or-0.2 MHz and P=0.10+or-0.05 MHz. The crystal field at the chromium site is smaller by more than an order of magnitude than for previously reported Cr3+ centres in LiNbO3, indicating that those centres are not on the Nb site.