Photoinduced molecular polar alignment in E-O polymers by all-optical poling holographic methods

A phenomenological model of photoinduced poling dynamics is developed on the basis of the experimental results. Given the intensities of the fundamental field and the second harmonic field used in the poling process, generation and relaxation of χ⁽²⁾ and χ⁽³⁾ nonlinear susceptibilities are described by this model. The cis and trans orientational order parameters up to the fourth order are used in the calculations. The fact that the laser used in experiments operates in pulses, rather than a continuous wave mode, is also taken into account in this model. The model could eventually be used to determine the optimal intensities of poling fields for efficient generation of nonlinear optical structures. We present results on all-optical poling kinetics of electro-optic active polyester type dendrimers Gl photo-patterned in the polycarbonate matrix.