Abstract: In this paper,the charge decay dynamic characteristic of the Teflon-AF/nonlinear optical polymer electret double layer system,which is poled with the method of constant voltage corona charging,is studied by means of measuring the open-circuit thermally stimulated discharge (TSD),electro-optical coefficient and surface potential decay. The results indicate that the reason of stability improvement of oriented dipoles for the double layer film system is that Teflon-AF electret layer have high storage stability of space charge,and the dipole alignment is kept by the field form ed by the space charge layer situated in the Teflon-AF layer and the interface between the Teflon-AF layer and the N LO polymer layer.

Key words: nonlinear opticalm aterial, stability of oriented dipoles, molecular dipole polymer electret, thermally stimulated discharge