IR-transparent crystallized glasses were fabricated by crystallization of the glass with a stoichiometric composition corresponding to target crystal and only crystallites were precipitated. A clear second-harmonic generation was observed in the crystallized glasses by the Maker fringe technique. The optical nonlinear susceptibility, , of crystallized glasses was found to be , being comparable to that created by thermal/electric or other poling methods, which opens a new way to an optical converter operating in the mid-IR spectral region.
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