Abstract
Transparent glass-ceramics, in which the crystalline phase has basically a face centered cubic structure, have been prepared in the system K2ONb2O5TeO2, and a second harmonic generation (SHG) is observed. The second harmonic intensity in the glass-ceramics is comparable to that in electrically poled TeO2-based glasses. A very small distortion from the cubic structure might be present and an origin of SHG. Transparent glass-ceramics consisting of the cubic crystalline phase have been also fabricated in the system of Li2O or Na2ONb2O5TeO2, but SHG is not observed.
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