Abstract
Photoinduced effects were studied in , making use of birefringence and second-harmonic generation as probes of structural modifications induced by illumination at 2.4 eV. It is shown that photoinduced charges have no direct influence on the size and orientational freedom of polar microregions. Quenching of the polar order by illumination is only observed in the presence of an external field and it is consistent with the build-up of a depoling field, owing to space-charge formation. Light of energy below 2 eV is not effective by itself, but it can be if the sample is pre-sensitized with photons of higher energy.
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