Spatially selected crystallization in glass by YAG laser irradiation

A continuous wave (cw) Nd:YAG laser operating at a wavelength of 1064 nm irradiated Sm 2 O 3 - and Dy 2 O 3 -doped glasses under various irradiation conditions in the systems of Ln 2 O 3 –BaO–B 2 O 3 (Ln:Sm and Dy), and non-linear optical β-BaB 2 O 4 (β-BBO) crystals lines are formed at the surface of glass substrates. It is proposed from the azimuthal dependence of second harmonic intensity that β-BBO crystal lines might be single crystals with the c -axis orientation along the laser scanning direction. The photoluminescence spectra indicate that Sm 3+ ions are incorporated into β-BBO crystal lines. The present study proposes that cw Nd:YAG laser irradiation to glass containing Sm 3+ and Dy 3+ is a novel technique for a spatially selected crystallization in glass.