Optical Nonlinearity Of Semiconductor Oxide Zno And Cdo Nanomaterials

In this dissertation, the development of nonlinear optics,laser protection and optical limiting are reviewed. The result of recent years, analysis methods of semiconductor materials and principle are summarized systemically. A kind of sensitive measurement of optical nonlinearities using a single beam Z-scan technique and its theoretical analysis are reviewed in details.Effects particle shape on the third-order optical nonlinearities of ZnO nanorods and ZnO nanoparticles are studied by using Z-scan technique with nanosecond pulses at 532nm.The experiment results show that the third-order optical nonlinearities of ZnO nanorods are stronger than that of ZnO nanoparitcles. Experimental results show that the third-order nonlinear optical performances strongly dependent on the shape of the nanomaterials as described by the Maxwell-Garnett Effective Medium Theory,MGT.Optical limiting(OL) properties of CdO nanowires in water and ethanol were investigated by using nanosecond laser pulses at 532nm.Experimental results show that suspension of CdO nanowires in ethanol exhibits better OL property than suspension of CdO nanowires in water.The dominant mechanism for the observed enhanced optical limiting in ethanol suspensions of CdO nanowires is due to nonlinear scattering.