Fresnoite-type Ba2TiGe2O8 glass-ceramics toward electro-optic device: Crystallization structure and Pockels effect

Haruki Okamoto, Yoshihiro Takahashi, Takuma Nakamura, Nobuaki Terakado, Takamichi Miyazaki, Takumi Fujiwara

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Optical modulation based on second-order optical nonlinearity is required to control a light-wave for telecommunication with optical-fiber network, and its controlling device is basically constructed using a single crystal material. To fabricate an optical device material having the connectivity to glass fiber, glass-ceramic (GC) processing is effective. In this study, a bulk-like GC material with a polar fresnoite-type Ba2TiGe2O8 were successfully fabricated. The obtained GCs were formed by densely-aggregated structure of two phase, fresnoite-type (major phase) and tetragermanate (minor phase). The fresnoite-type Ba2TiGe2O8 domains with submillimeter-sized were oriented with the polar c-axis perpendicular to sample plane. The GC sample exhibited the optical modulation driven by Pockels effect, and the Pockels coefficients could be quantitatively estimated, i.e., r13 = 2.3 ± 0.1 pm/V and r33 = 2.5 ± 0.1 pm/V. The experimental results demonstrate the potential of higher Pockels coefficients by microscopic structural studies, because of good controllability of the polar orientation and suppression of secondary phase.

Original languageEnglish
Pages (from-to)5576-5581
Number of pages6
JournalJournal of the European Ceramic Society
Issue number15
Publication statusPublished - 2020 Dec


  • Crystallisation
  • Fresnoite
  • Glass-ceramics
  • Nonlinear optical crystal
  • Pockels effect

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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