Abstract
Glasses in a wide range of chemical composition were thermally poled and the stability of the second-order optical nonlinearity induced was studied through isothermal annealing experiments. Enhanced stability was found in aluminosilicate and aluminoborosilicate with respect to silica (at least a five order of magnitude increase in lifetime). Such dramatic enhancement was explained by the strong decrease of the alkali ion mobility due to specific changes in glass composition.
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