Patterning of Ferroelectric beta'-Gd2(MoO4)3 Crystal Lines on the Glass Surface by Transition Metal Atom Heat Processing

摘要

Lines consisting of ferroelectric beta'-Gd2(MoO4)3 crystals are patterned on the surface of NiO (2 mol%)-doped 21.25Gd2O3·63.75MoO3·15B2O3 glass by continuous wave (cw) Nd:YAG laser irradiations with a wavelength of lambda=1064 nm,where laser energies absorbed by Ni2+ions are converted to the local heating of surrounding Ni2+ions.The surface morphology of crystals in the patterned lines is clarified from confocal scanning laser microscope observations.beta'-Gd2 (MoO4) 3 crystal lines patterned by laser irradiations with a power of 0.73 W and a scanning speed of 2.5 mu m/s show a smooth surface with a bump (width:9 mu m,height:3 mu m),and it is suggested from polarized micro-Raman scattering spectra that beta'-Gd2(MoO4)3 crystals might orient along the laser scanning direction.The present study demonstrates that the transition metal atom heat processing,i.e.,a combination of cw Nd:YAG laser and Ni2+ions,is a novel technique for spatially selected crystallization in rare-earth containing glasses.