Abstract
We consider the effect of photoinduced optical anisotropy (POA) in azopolymers.Using a unified approach to the kinetics of photo-reorientation we discuss theassumptions underlying the known theoretical models of POA and formulate atractable phenomenological model in terms of angular redistribution probabilitiesand order parameter correlation functions. The model takes into accountbiaxiality effects and long-term stability of POA in azopolymers. It predicts thatunder certain conditions two different mechanisms, photo-orientation andphotoselection, will dominate POA depending on the wavelength of pumpinglight. By using available experimental data, we employ the model to computedependences of principal absorption coefficients on the illumination time. Ourcalculations clearly indicate the different regimes of POA and the numericalresults are found to be in good agreement with the experimental data.
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