Writing of crystal line patterns in glass by laser irradiation

Abstract We examined the laser-induced crystallization to form the fresnoite type Ba 2 TiGe 2 O 8 crystal line patterns in transition metal ion doped BaO–TiO 2 –GeO 2 glass. Ba 2 TiGe 2 O 8 crystal line was written in 0.6FeO–33.3BaO–16.7TiO 2 –50GeO 2 glass by continuous wave yttrium–aluminum–garnet (YAG) laser irradiation. We obtained polarization dependence of Raman spectra in crystal line pattern. Second harmonic generation (SHG) indicated unique fringe patterns from Ba 2 TiGe 2 O 8 crystal lines.