Stoichiometric Crystallized Glasses with Large Second-Order Optical Nonlinearities

Abstract

Transparent crystallized glass consisting of nonlinear optical crystal is a promising material with permanent properties on second-order optical nonlinearity. Challenges, to obtain the largest second-order optical nonlinearity ever reported, have been performed by taking account of novel glass composition for crystallization, i.e., systems and stoichiometry in crystalline/glass phases. New transparent crystallized glasses have been successfully fabricated from the glasses with the exact or close stoichiometric composition corresponding to crystals, and their second-order optical nonlinearities are presented in this article. We found that the d₃₃ value of a transparent crystallized glass with stoichiometric composition of optical nonlinear crystal was equivalent to that of corresponding single crystal. Moreover, the very large d₃₃ value, being comparable to that of LiNbO₃, was achieved in the newly developed transparent crystallized glass with Ba₂TiGe₂O₈ crystal.