The growth of photorefractive planar BTO/BSO and BTO/BGO waveguide

Abstract The Bi 12 TiO 20 thin films with high optical quality were grown from the melt on a substrate of Bi 12 SiO 20 and Bi 12 GeO 20 single crystals by two methods: LPE and crystallization from finite volume (CFV). The results of experimental investigation of time evolution of light-induced absorption in BTO:Cu waveguide are presented. All structures show a nearly equidistant spectrum of n eff with intervals from 2×10 −3 to 5×10 −3 . The time evolution of light-induced absorption is qualitatively different for the lowest and the highest modes in the waveguide.