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

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

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Abstract

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
Volume96
Issue number19
DOIs
Publication statusPublished - 2010

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thresholds
kinetics
crystals
ions
temperature
vibration
energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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Thermal kinetics of OH- ions in LiNbO3 : Mg crystals above the photorefractive threshold. / Lengyel, K.; Kovács, L.; Péter, A.; Polgár, K.; Corradi, G.; Baraldi, A.; Capelletti, R.

In: Applied Physics Letters, Vol. 96, No. 19, 191907, 2010.

Research output: Contribution to journalArticle

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AU - Polgár, K.

AU - Corradi, G.

AU - Baraldi, A.

AU - Capelletti, R.

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