摘要
1 Introduction The materials with large and fast third-order nonlinearities are of considerable interest because of their important applications in all optical signal processing, optical computing and phase conjugation. Recently, the third-order nonlinear optical properties of semiconductor microparticles (such as CdS<sub>x</sub>Se<sub>1-x</sub> doped glasses) have received much attention. It is known that the PbS and CdS colloidal microparticles also have
基金
Project supported by the National Natural Science Foundation of China and the Science Foundation of the Laboratory of Excited State Processes, Changchun Institute of Physics, Academia Sinica.
