简介:PbSnanoparticlesmodifiedbyapolymer(P-PbS)wasprepared,andthetransientnonlinearopticalpropertiesstudiedbyfemtosecondopticalKerreffect(OKE)spectroscopyforthefirsttime.Averylargenonlinearopticaleffect(X^(3)-5.6×10^-12esu)withresponsetimecomparabletothelaserpulse(-165fs)wasobserved.ComparingwithPbSnonoparticlesstabilizedwithPVAandcoatedwithsodiumdodecylebenzenesulphonate(DBS).theopticalnonlinearityofthePbSnanoparticlesmodifiedbythepolymerismuchlargerthanthoseofthem.Thereafter.thecorrespondingnonlinearitymechanismwasinterpreted.