Abstract
MgO-doped near-stoichiometric LiNbO 3 crystals have been grown by the high-temperature top-seeded solution growth method from the K 2O–Li 2O–Nb 2O 5 flux. The critical threshold concentration of MgO required to minimize photorefractive damage in the crystals has been determined on the basis of the liquid–solid phase relations. The lowest MgO concentration in the melt where above-threshold crystals can be still grown with near-stoichiometric crystal composition was 0.2 mol%. At near-threshold MgO concentration, a transitional region was detected along the crystal growth axis, where two OH − absorption bands peaking at 3465 and 3534 cm −1 frequency were observed in the IR spectra at the same time.
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