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With the progresses in electronics and optoelectronics,the information-stored materialsused in signal process need to have higher stored density and faster response speed.Recent theoretical researches indicate that when the grain size of semiconductor is less than10nm,the 3rd nonlinear optical susceptibility and fast response speed will be enhanced.Therefore nanocomposite is expected to become an advanced information-stored material,and receives more attention.In 1983,Jain and Lind observed larger 3rd nonlinear optical