Space-selectively crystallized fiber with second-order optical nonlinearity for variable optical attenuation

Abstract

We have fabricated BaO-TiO2-GeO2-SiO2-based glass fibers with the oriented space-selectively crystallized structure by laser irradiation and also demonstrated variable optical attenuation induced by electro-optical birefringence change based on second-order optical nonlinearity. The transmittance of a polarized signal is controlled by an electric field applied to the fiber, and the electro-optic fiber devices are operated with extremely low nanowatt electric power dissipation.

Surface crystallization of Fresnoite-type crystallized glasses with large thickness

“…Recently, Ohara et al reported novel electrooptic (EO) devices fabricated using special structured fibers, doubly clad in crystallized glass with oriented surface crystallization. 1) Although nanowatt EO operations have been performed for variable optical attenuation, large excess loss due to crystallization might be an important consideration for future applications.…”

Formation of spherulite and metastable phase in stoichiometric Ba2Si3O8 glass

“…Recently, new glass-ceramic materials have been developed for applications such as advanced photonicdevices and solid-state lighting components. 1)3) Another class of materials are the alkali/alkali-earth silicate system glasses, in particular stoichiometric glasses. These materials are significant for illustrating the amorphous structure and nucleation and crystallization processes in oxide glasses.…”

Surface crystallization of CaO–Bi2O3–B2O3–Al2O3–TiO2 glass using IR furnace

“…In the case of BaO-TiO 2 -GeO 2 -SiO 2 based multi-clad fiber [9], which consisted of non-doped core (diameter: 6.5 μm), CuO-doped 1st clad (24.5 μm), and non-doped 2nd clad (125.0 μm), we have already succeeded in preparing space selective crystallization using TM atom heat processing [10]. The incident light, which was transmitted in the 2nd clad, was absorbed to induce crystallization in the 1st clad region.…”