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Abstract
The linear electro-optical effect has been studied in test samples of two different nonlinear optical polymers–with Tg of 140°C and 175°C, respectively–during and after poling. The electro-optical coefficients were measured between crossed polarizers (r33 – r13) and using the test samples as Fabry-Perot interferometers (r13). The field strength dependence of the coefficients has been measured during poling of the polymer with Tg = 140°C, and compared with theory. Also, the ratio r33/r13 has been investigated. A quasi-instantaneous loss of the field-induced electro-optical activity is observed when the poling field is switched off at ambient temperature after poling in the vicinity of Tg . The influence of an annealing step on the relaxation behavior is discussed. Results of relaxation experiments in the two polymers performed at several constant temperatures are presented.
