Crystallization of langasite-type phases in gallium germanate glasses and optical properties of crystallized glasses

S. Kosaka, Y. Takahashi, Y. Benino, T. Fujiwara, T. Komatsu

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Langasite-type crystals such as Ba3Ga2Ge4O14 and BaGa4La2Ge2O14 are formed through the crystallization of gallium germanate glasses with stoichiometric compositions corresponding to langasite-type phases and optical properties of crystallized glasses are clarified. It is found that the single langasite-type phase is easily formed in each corresponding glass. The crystallized glasses with highly oriented langasite-type crystals at the surface are fabricated using an ultrasonic surface treatment method. The crystallized glasses with BaxGa5-xLa3-xGe1+xO14 phases show moderate second harmonic (SH) intensities of 5-75 times as large as α-quartz, and it is found that the SH intensity of BaxGa5-xLa3-xGe1+xO14 phases increases with the increase of the La3+/Ba2+ ratio. The feature of fluorescence spectra of Eu3+ ions incorporated into langasite-type crystals is also discussed.

Original languageEnglish
Pages (from-to)1129-1135
Number of pages7
JournalOptical Materials
Issue number10
Publication statusPublished - Jul 2006
Externally publishedYes


  • Crystallized glass
  • Gallium germanate glass
  • Langasite-type crystals
  • Second harmonic generation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Computer Science
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering


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