A model for second harmonic generation in poled glasses
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The microscopic description of the poling process allows us to describe the occurrence of second-order nonlinear susceptibilities in thermally poled glasses. At high temperature and during poling, the ionic impurities move towards the electrodes to screen the applied voltage. The high electric field appearing at both interfaces of the sample can reorient polar and highly nonlinear moieties and induce a second-order susceptibility. After poling, the reoriented molecules and induced charge distribution are frozen. The latter creates a static permanent electric field which may result in an electric field-induced second-order nonlinearity. This model makes it possible to optimize the induced nonlinearities.
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