Properties of Ru-doped near-stoichiometric lithium niobate crystals produced by vapor transport equilibration

Chang Hung Chiang, Jyh Chen Chen, Tzu Ming Huang, Chieh Hu

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Ruthenium (Ru)-doped near-stoichiometric lithium niobate crystals (Ru:SLN) were prepared by the vapor transport equilibration (VTE) technique from Ru-doped congruent lithium niobate (CLN) grown using the Czochralski method. Increasing the duration time of the VTE treatment caused the ratio of [Li]/[Nb] in the crystal to increase, which in turn caused the absorption edges to shift to violet. The absorption coefficient in the UV/VIS absorption spectra at 530 nm decreased because of the change in the valence of the Ru ions cause by the VTE treatment. The OH- absorption spectra showed that the broad band located at 3482 cm-1 gradually decreased while another band located at 3466 cm-1 gradually increased and the shape became sharper as the VTE treatment time increased. When the VTE treatment time reached 200 h, Ru-doped near-stoichiometric lithium niobate crystals were obtained. Two-beam coupling examination with a 532 nm laser showed that the Ru-doped near-stoichiometric lithium niobate crystals had a larger exponential gain coefficient, lower diffraction efficiency, faster response time, and higher sensitivity than did the Ru-doped CLN crystals.

Original languageEnglish
Pages (from-to)2678-2682
Number of pages5
JournalJournal of Crystal Growth
Volume310
Issue number10
DOIs
StatePublished - 1 May 2008

Keywords

  • A1. Defects
  • A1. Diffusion
  • A1. Doping
  • B1. Lithium compounds
  • B2. Photorefractive materials

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