Thermal fixing of holographic gratings in nearly stoichiometric LiNbO3 crystals

Gábor Mandula, Krisztián Lengyel, László Kovács, Mostafa A. Ellabban, Romano A. Rupp, Martin Fally

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The thermal decay of holographic gratings recorded using the conventional two-wave mixing technique has been studied in congruent and nearly stoichiometric LiNbO3 crystals doped with Mn. The activation energies of this process have been determined in the 70-130°C range for congruent and 20-80°C range for nearly stoichiometric crystals, the obtained values being 1.06 ± 0.03 and 1.10 ± 0.03 eV, respectively. The kinetics of the OH absorption spectrum has also been studied in undoped nearly stoichiometric LiNbO3 between 40-120°C. The time dependence of the band intensities can be characterized by exponential time constants obeying the Arrhenius-law. The average activation energy, Ea ≈ 1.1 ± 0.1 eV is in good agreement with those obtained from the thermal decay indicating that the hologram fixing process in nearly stoichiometric LiNbO3 is governed by proton migration.

Original languageEnglish
Pages (from-to)226-230
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4412
Issue number1
DOIs
Publication statusPublished - Aug 10 2000

Keywords

  • Activation energy
  • Hologram fixing
  • OH absorption
  • Proton migration
  • Thermal decay

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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