In situ Investigation of OH- Absorption in LiNbO3 and LiNbO3:MgO Crystals during Reducing/Oxidizing Annealing

Yu. Sugaka, D. Sugaka, b, Ya. Zhydachevskiia, I. Solskiib, O. Buryya, S. Ubizskiia and K.-D. Beckerc a Lviv Polytechnic National University, Lviv, Ukraine b Institute of Materials, SRC "Carat", Lviv, Ukraine c Institute of Physical and Theoretical Chemistry, Technical University Braunschweig, Braunschweig, Germany

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The work presents experimental results of an in situ investigation of the OH- absorption in pure and MgO-doped LiNbO3 crystals during reducing (95% Ar + 5% H2) and oxidizing (O2) high-temperature treatments in the temperature range from room temperature to 820 K. The absorption spectra measured in situ at high temperatures in reducing/oxidizing atmospheres have been analyzed. The origin of the changes in optical absorption caused by heating of the crystal is discussed in terms of the OH-bonds orientation change.

DOI: 10.12693/APhysPolA.117.170 PACS numbers: 42.70.Mp, 78.30.-j, 77.84.-s