In situ measurements of thermal poling of germanosilicate fibres under positive and negative poling voltages show the dynamics of frozen-in electrical fields in the fibre. The existence of the frozen-in fields are revealed by HF etching and AFM measurement of the poled fibres. These results support the electrical-field-induced X(2) model for the induced electro-optic effect.

© 1999 Optical Society of America

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