光折变暗孤子和旋涡孤子过去两．年中，光折变材料空间孤子已成了强烈感兴趣的对象。迄今已研究了三种不同类型的光折变孤子。如同折射率扰动与光强分布横向导数关系所显示，有一类光折变孤子起源于光折变效应的非局域性。当衍射严格被孤子光束空间（平面波）成份的自散射... Light fold darker solitons and vortex solitons past two. Years, photorefractive material space soliton has become a strong object of interest. So far, three different types of photorefractive solitons have been studied. As the relationship between the refractive index perturbation and the lateral derivative of the light intensity distribution shows, there is a class of photorefractive solitons that originate from the non-localized photorefractive effect. When the diffraction is strictly soliton beam space (plane wave) component of the self-scattering ...