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BaTiO3晶体的光折变应用之前，必须对晶体进行单畴化处理．根据BaTiO3晶体中90°电畴结构和包裹体之间的关系，我们找到一种在晶体极化之前就能有效地检查出BaTiO3晶体中包裹体的方法．根据BaTiO3晶体中90°电畴和180°电畴的形成特点，既可以让晶体以缓慢速度降温通过顺电-铁电相交点（1℃／15min），消去BaTiO3晶体的90°电畴，也可以用在α轴方向上施加一定的压力消去BaTiO3晶体的90°电畴．180°电畴可以在晶体的温度接近居里点时，通过在（001）面上施加1～3×105V／m的电场来消除
Before the photorefractive application of BaTiO3 crystals, the crystals must be monodomated. Based on the relationship between the 90 ° domain structure and inclusions in BaTiO3 crystals, we find a way to effectively detect inclusions in BaTiO3 crystals prior to crystal polarization. According to the formation of 90 ° and 180 ° domains in BaTiO3 crystals, the crystal can be cooled at a slow speed through the paraelectric-ferroelectric point of intersection (1 ° C / 15 min) to eliminate the 90 ° domain of the BaTiO3 crystal, The 90 ° domain of the BaTiO3 crystal was eliminated by applying a certain pressure in the direction of the α-axis. The 180 ° domain can be eliminated by applying an electric field of 1 to 3 × 10 5 V / m on the (001) plane when the temperature of the crystal is near the Curie point