Weak-light nonlinear optical effect and its application

Some recent work on weak-light nonlinear optics is presented,such as the defect structure in weak-light nonlinear photonic materials,light propagation dynamics in mesoscopic quantum coherent ensemble,optical nonlinearity at ultraslow group velocity of light and so on.The recent research results in new type exciton with ultraviolet weak-light nonlinear optical effect,the phase coupling with light speed control,and optical lattices induced by spatial soliton pixels of incoherent light with the light nonlinear propagation characters are also described.