Thermal Fixing of Holographic Gratings in Nearly Stoichiometric LiNbO3 Crystals

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 deg C range for congruent and 20-80 deg 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 deg C. The time dependence of the band intensities can be characterized by exponential time constants obeying the Arrhenius-law. The average activation energy, E(sub a) approx. 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.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2001
Accession Number
ADP011902

Entities

People

  • Gabor Mandula
  • Krisztian Lengyel
  • Laszlo Kovacs
  • Mostafa A. Ellabban
  • Romano A. Rupp

Organizations

  • Hungarian Academy of Sciences

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Absorption
  • Absorption Spectra
  • Agreements
  • Diffraction
  • Energy
  • Heat Of Activation
  • Heat Treatment
  • Holograms
  • Intensity
  • Measurement
  • Physical Properties
  • Physics
  • Physics Laboratories
  • Protons
  • Refractive Index
  • Spectra
  • Wave Mixing

Fields of Study

  • Materials science
  • Physics

Readers

  • Materials Science and Engineering.
  • Optical Physics and Photonics.