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Optical nonlinearities, optical bistability and optical phase conjugation in semiconductors, composites and thin films

In this paper, we give new explanations of optical nonlinearities of band filling in semiconductors for different recombinations and semiconductor-glass composites made up of small semiconductor particles embedded in an insulating glass matrix, and experimental results of quantum effects of semiconductor doped glasses(SDG). We present a new kind of ZnS film doped ZnSe and Cu, which is waterproof and dampproof, and study its optically bistable characteristics and structure. We also report the experiment of low power phase conjugation in thin film of saturable absorber.