摘要
The optical nonlinear properties of CdSeS/ZZnS quantum dots （QDs） are investigated by Z-scan technique using fundamental harmonic generation （1064 nm） of mode-locked Nd： YAG laser for the/irst time. The experimental results show that two photon absorptions （TPA） occur at input intensity up to 12.5 GW/cm^2. CdSeS/ZnS QDs have an average TPA cross section of 13710GM and large nonlinear refractive index on order of 10^-7 esu. The large optical nonlinearities perhaps allow the CdSeS/ZnS QDs to be one kind of candidate material for bioimaging and fluorescence label, optical limiting and all-optical switching.
The optical nonlinear properties of CdSeS/ZZnS quantum dots （QDs） are investigated by Z-scan technique using fundamental harmonic generation （1064 nm） of mode-locked Nd： YAG laser for the/irst time. The experimental results show that two photon absorptions （TPA） occur at input intensity up to 12.5 GW/cm^2. CdSeS/ZnS QDs have an average TPA cross section of 13710GM and large nonlinear refractive index on order of 10^-7 esu. The large optical nonlinearities perhaps allow the CdSeS/ZnS QDs to be one kind of candidate material for bioimaging and fluorescence label, optical limiting and all-optical switching.
