A new polymer thin film,ploy(2-chloro-1,4-phenylene vinylene)(ClPPV),with high environmental and thermal stability,high optical damage threshold,and good film quality,was successfully prepared by the“precursor-route”method.Its third-order optical nonlinearities were measured by picosecond forward three-dimensional degenerate four-wave mixing technique.In the near resonance region(532nm),the measured third-order nonlinear optical coefficients x(3)zzzz and x(3)yzzy are 9.1 × 10^(-10) and 7.2 × 10^(-11) esu,respectively,and its response time is quite fast,estimated to be less than picosecond.The Kerr effect,which arises from the distortion of the large quasi-one-dimensionalπ-conjugated electronic charge distribution of ClPPV,is the main reason for generating third-order optical nonlinearities.
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