Abstract
We present evidence that vapor transport equilibration (VTE) of lithium tantalate crystals in lithium vapor produces layers tens to hundreds of microns thick which differ in phase composition and stoichiometry. Stoichiometric layers, up to 500 μm in thickness, have a coercive field tens of times lower than that in congruent lithium tantalate single crystals, which makes them suitable for producing regular domain structures that can be used in the fabrication of integrated optic devices: optical converters and minilasers. After VTE processing, a thin (within 30 μm) surface layer of single-crystal lithium tantalate has a new, polar (ferroelectric) structure with a phase transition temperature of ∼120°C.
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