Formation of fresnoite-type Ba2TiGe2O8 crystallites in BaO-TiO2-GeO2 glass thin film and its optical nonlinearity

Ryoh Ogawa, Hirokazu Masai, Yoshihiro Takahashi, Takumi Fujiwara

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We report on fabrication of the BaO-TiO2-GeO2 glass thin films on a fused silica substrate by RF sputtering, and investigation of the crystallization behavior, surface texture and the optical non-linearity in the glass thin film by means of AFM, XRD, Raman and Maker fringe techniques. Although the Ba2TiGe2O8, hereafter abbreviated to BTG, phase with second-order optical nonlinearity was mainly crystallized, the precipitation of the sub-phase of BaGe4O9 was also confirmed in the heat-treated glass thin films. In the glass thin film heat-treated at heat-treatment temperature (7HT) = 730-750°C, the (211) preferential orientation of BTG phase and an upheaval about 300-400 nm were confirmed at the surface. These transparent crystallized glass thin films indicated a clearly Maker fringe patterns, demonstrating a second-order optical nonlinearity, and the effective second-order nonlinear optical constant, d eff, was estimated to be ∼0.8 pm/V.

Original languageEnglish
Pages (from-to)1130-1133
Number of pages4
JournalJournal of the Ceramic Society of Japan
Issue number1358
Publication statusPublished - 2008 Oct


  • Crystallization
  • Fresnoite-type crystal
  • Glass
  • Optical nonlinearity
  • Thin film

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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