In this paper, the poling properties of （PS）O-DCV, a derivative of poly （p-hydroxystyrene ）, was reported. The investigations showed that the thermochromism correction, which was neglected in the literatures, should be considered in the measurements of order parameter of poled films with electrochromism technique Here, another linear optical method, IR and polarized IR spectra for characterizing of poled films was suggested first time. The bulk second nonlinear optical coefficient d33 of poled films could be estimated by measured order parameter semi-qualitatively.
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