Fabrication of transparent fresnoite-type Ba2TiGe2O8 crystallized glasses and effects of cation substitution

Abstract

Transparent optical nonlinear crystallized glasses with Sr_xBa_2-xTiGe₂O₈ crystals have been successfully fabricated from glasses with stoichiometric and Sr-substitution compositions of Ba₂TiGe₂O₈ crystal, i.e., xSrO·(40-x)BaO·20TiO₂·40GeO₂, by means of careful heat-treatment in the temperature region of 670-700°C for 3h. Their second-order optical nonlinearities have been quantitatively evaluated using Maker fringe technique. As a result, of the increase in c/a axis ratio bring about the increase in second-order optical non-linearity of crystallized glasses have been cleared.