详细介绍了极化聚合物薄膜中二阶非线性系数的测定方法，讨论了在这种体系中进行时间稳定性研究的有关问题．估计了ＤＡＮＳ掺杂的这种聚合物中从取向状态到无序分布的表观活化能，讨论了最优入射角θ．在弛豫过程中的变化幅度与材料的时间稳定性的关系． The method to determine the second-order nonlinearity coefficient in polarized polymer films is introduced in detail, and the related problems of time stability in this system are discussed. The apparent activation energies from disordered states to disordered states in DANS-doped polymers were estimated, and the optimal angle of incidence θ was discussed. The relationship between the amplitude of change in the relaxation process and the time stability of the material.