Thermal kinetics of OH- ions in LiNbO3:Mg crystals above the photorefractive threshold

K. Lengyel, L. Kovács, Á Ṕter, K. Polgár, G. Corradi, A. Baraldi, R. Capelletti

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OH stretching vibrations in LiNbO3 (LN) crystals having various Li/Nb ratios and doped with Mg above the photorefractive threshold concentration were investigated in the 20-500 °C temperature range. Beside the 3534 cm-1 above-threshold band another peak at about 3465 cm-1, known from below-threshold stoichiometric LN, was found to appear at a temperature depending on the Mg surplus concentration and grow further with increasing temperature at the expense of the 3534 cm-1 band. The energy difference between the OH- ions was determined to be Δ E=0.25±0.02 eV independently from the composition and Mg concentration. A kinetic model describing the thermal process predicts a linear Mg surplus dependence of the ratio of band areas at a given temperature.

Original languageEnglish
Article number191907
JournalApplied Physics Letters
Issue number19
Publication statusPublished - Jun 7 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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