Abstract
A transverse quadratic electro-optic effect has been observed in a wide range of niobate transparent glass—ceramic systems. The electro-optic constant has been determined as a function of composition, temperature, and wavelength. A semiquantitative measurement of the frequency response has also been made. It has been found that the electro-optic constant correlates reasonably well with the square of the static dielectric constant. Remanent polarization has been induced under the influence of a dc field. The resulting linear electro-optic effect has been measured in both transverse and longitudinal modes.

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