The effect of side chains with different length on the optical properties of two PPV derivatives,poly(2,5-dioctyloxy-1,4phenylenevinylene) and poly(2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylenevinylene),was investigated by absorption spectroscopy,fluorescence spectroscopy and picosecond Z-scan technique.

The third-order optical nonlinearity of inorganic compound RuCl_2(depe)_2 was studied by using Z-scan technique with a double-frequency Nd: YAG laser system at 532nm with pulse width of 8ns, The nonlinear refractive index n_2 of RuCl_2(depe)_2 was measured which was about 5.

The linear and nonlinear optical properties of three porphyrin compounds with different substituents,meso-tetra(p-hydroxyphenyl) porphyrin [T(4-HP)P],meso-tetra(p-esterphenyl) porphyrin [T(4-EP)P] and meso-tetra(p-bromophenyl) porphyrin [T(4-BrP)P] have been investigated by using Absorption spectroscopy,fluorescence spectroscopy and picosecond Z-scan technique.

Theory analysis on Z-scan technique of cascade structure for the nonlinear absorption materials;

Roboticized Laser Beam Z-scan System Based on Labview;

Theoretical analysis of Z-scan using one dimensional partially coherent beams;

Z-scan Measurements of the Third-order Nonlinear Optical Properties in AπDπA Carbozole Derivatives;

Z-scan Measurement on the Third-order Nonlinear Optical Absorption of Conjugated PPQ Polymer Film;

Gaussian beam Z-scan diffraction theory model for the strong nonlinear absorption materials;

Using the single beam Z scan technique with 38 ps pulse at 1.

The broadening effect of ultrashort laser pulse due to optical components is theoretically calculated and a Z scan system with small internal dispersion based on Al coated mirrors is reported.