The CdTe nano crystals were successfully synthesized\nusing a facile room temperature method with\nnon-toxic and environmentally friendly capping agent. The\nobtained CdTe nano crystals were characterized by UVââ?¬â??Vis\nabsorption spectroscopy, transmission electron microscopy,\nand z-scan technique. A photo luminescence peak with full\nwidth at half maximum of around 15 nm could be obtained,\nwhich indicates a homogeneous and narrow size distribution\nfor the CdTe nano crystals. The magnitude and sign\nof the third-order nonlinear refractive index (n2) and nonlinear\nabsorption coefficient (?) of the CdTe nano crystals\nwere determined by using of the closed- and open-aperture\nz-scan at different intensities, respectively. The negative\nsign of n2 indicated that there is a self-de focusing effect\nin the sample. The nonlinear refractive index, n2, and\nthe nonlinear absorption coefficient, ?, were in order of\n10?7 cm2W?1 and 10?2ââ?¬â??10?3 cmW?1, respectively.
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