Second-order NLOP film is created by aligning the appropriate chromophores into a polymeric host medium by poling in an electric field followed by permanent fixation. The poling is usually conducted near Tg but the maintenance of poled order is often difficult even at room temperature because of the relaxation of the chromophore units which destroys the orientation of poled dipoles. The experiments were repeated at 1 g under the same conditions. The sample thickness was fixed at 2 mum, however poling field, UV intensity, chromophore type and concentration, poling temperature and cooling rate were varied. Qualitatively experimental results support the simulation hypothesis.
Additional experiments are necessary to control and confirm the results.