Abstract

In this Letter, we show functionalization of NiO-doped $7.5{\mathrm{Li}}_2\mathrm{O}·2.5{\mathrm{Na}}_2\mathrm{O}·20{\mathrm{Ga}}_2{\mathrm{O}}_3·35{\mathrm{SiO}}_2·35{\mathrm{GeO}}_2$ glass by space-selective nanocrystallization via exposure to the focused beam of a pulsed copper vapor laser (510.6 and 578.2 nm) at temperature close to the glass transition point (570°C). Irradiated areas drastically change their color, caused by electronic transitions of ${\mathrm{Ni}}^{2+}$ dopant ions, without any alteration of the optical quality. Importantly, irradiated regions acquire broadband infrared luminescence (centered at about 1400 nm and possessing 400 nm effective bandwidth) typical of ${\mathrm{Ni}}^{2+}$ ions in crystalline environment, and by positive change of refractive index (more than ${10}^{-3}$). Spectroscopic and diffractometric data of the irradiated regions indeed resemble those previously observed in thermally nanocrystallized glass, with ${\mathrm{Ni}}^{2+}$ ions embedded in $\gamma \text{-}{\mathrm{Ga}}_2{\mathrm{O}}_3$ nanocrystals. The results demonstrate the possibility of laser writing nanocrystallized multifunction patterns in germanosilicate glasses for the fabrication of active integrated devices.

© 2013 Optical Society of America

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