Abstract
BaTiO3 crystals synthesized through the crystallization of 40BaO–40TiO2–15SiO2–5Al2O3 glass were characterized from Raman scattering spectrum, second harmonic generation (SHG), and polarization measurements. The structure of BaTiO3 nanocrystals (~70 nm) formed initially was suggested to be pseudo-cubic (small tetragonality), and perovskite-type ferroelectric BaTiO3 crystals were formed in the heat-treatments at high temperatures of ~930°C. The lines consisting of BaTiO3 crystals were patterned at the surface of CuO-doped glass by irradiations of continuous-wave Yb:YVO4 lasers with a wavelength of 1080 nm. It was confirmed that BaTiO3 being present in the laser-irradiated parts exhibits SHGs and, in particular, BaTiO3 formed in the laser ablation region has a tetragonal structure and a Curie temperature of ~135°C.
