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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% H-2) and oxidizing (O-2) 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.

In situ Investigation of OH-Absorption in LiNbO3and LiNbO3:MgO Crystals during Reducing/Oxidizing Annealing

In situ Investigation of OH^-Absorption in LiNbO₃and LiNbO₃:MgO Crystals during Reducing/Oxidizing Annealing