Title :
Influence of current anisotropy on self-focusing in photorefractive crystals
Author_Institution :
Inst. Nacional de Astrofisica, Opt. y Electron., Puebla, Mexico
Abstract :
Summary form only given. Photorefractive ferroelectrics have quite strong anisotropy of photocurrent. In barium titanate the typical ratio between conductivities in a- and c-directions is 14-20:1. In strontium barium niobate (SBN) this ratio is 1:3, ie. in this crystal the conductivity is higher along the c-axis, whereas in BaTiO/sub 3/ it is higher along the a-axis. Previous analysis of circular beam self-focusing (2D screening solitons) was not taking this factor into account. We demonstrate numerically that the existing anisotropy can dramatically affect the shape of self-focused beam.
Keywords :
barium compounds; ferroelectric materials; optical self-focusing; optical solitons; photorefractive materials; strontium compounds; 2D screening soliton; BaTiO/sub 3/; SBN; SrBaNb2O6; circular beam self-focusing; electrical conductivity; photocurrent anisotropy; photorefractive ferroelectric crystal; Anisotropic magnetoresistance; Barium; Conductivity; Ferroelectric materials; Niobium compounds; Photoconductivity; Photorefractive effect; Solitons; Strontium; Titanium compounds;
Conference_Titel :
Lasers and Electro-Optics Europe, 2000. Conference Digest. 2000 Conference on
Conference_Location :
Nice
Print_ISBN :
0-7803-6319-1
DOI :
10.1109/CLEOE.2000.909903
