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在硅酸铋（Bi12SiO20，BSO）晶体中掺入少量Fe2O3，生长出Fe：BSO晶体，由于Fe杂质在BSO晶体禁带中造成了一些缺陷能级，使得晶体的衍射效率和四波混频位相共轭反射率等光折变性能指标有较大提高。文中根据吸收光谱，初步确定了晶体中缺陷能级。
In the bismuth silicate (Bi12SiO20, BSO) crystals doped with a small amount of Fe2O3, grow Fe: BSO crystals, due to Fe impurities in BSO crystal forbidden band caused some defect level, making the crystal diffraction efficiency and four-wave mixing phase Conjugated reflectivity and other properties of photorefractive greatly improved. According to the absorption spectrum, the defect level in the crystal was preliminarily determined.