OPTICAL NONLINEAR PROPERTIES OF PBS NANOPARTICLES STUDIED BY THE Z-SCAN TECHNIQUE

The optical nonlinear properties of PbS nanoparticles in polyvinyl alc ohol (PVA) sol were studied by the Z-scan technique with 50 ps pulses at 530 and 1060 nm, respectively. The sample under these two excitatio ns shows quite contrasting nonlinear optical responses. The saturation absorption at 520 nm is observed while at 1060 nm the two-photon abso rption. The optical limiting of PbS nanoparticles were also investigat ed at 530 and 1060 nm (C) 1998 Published by Elsevier Science B.V. All rights reserved.