Abstract
Here we report on the production of crystal-free light guiding fibers using a preform-to-fiber approach in the germano-gallate glass system Ga2O3-GeO2-BaO-La2O3-Y2O3 for various contents of gallium to germanium. For glasses in the system Ga2O3-GeO2-BaO-K2O, where surface crystallization precludes fiber drawing from the preform, an open-crucible technique enables the drawing of fiber samples tens of meters long. Cut-back optical attenuation measurements show the extended transmission in the mid-infrared of the produced fibers, up to 2.8 µm with minimum losses of 3.1 dB/m at 1310 nm from unpurified glass. These results show that the germano-gallate glasses represent promising mid-infrared materials over an extended fiber drawing domain.
Highlights
There is currently a critical need in designing new infrared (IR) optical materials for developing integrated IR optical fiber devices, for applications either as passive medium for telecommunication, remote sensing and detection, or as active fiber-laser medium upon doping with luminescent-active elements
Preform prior to drawing shows no signs of heterogeneities or inclusions (Fig. 3(a)), the preform neck-down and cane show detrimental surface crystallization preventing the drawing of fibers of optical quality (Fig. 3(b))
We report on the drawing into optical fibers of germano-gallate glasses having various contents of gallium to germanium
Summary
There is currently a critical need in designing new infrared (IR) optical materials for developing integrated IR optical fiber devices, for applications either as passive medium for telecommunication, remote sensing and detection, or as active fiber-laser medium upon doping with luminescent-active elements Based on their extended transmission in the infrared and their tailorable thermo-mechanical properties, fluoride, tellurite and chalcogenide glasses have been extensively considered as optical components and devices [1]. We investigate the open-crucible technique for potassium-containing glasses As it relies on the whole melting of the glass, this method, already largely employed in fluoro-phosphate and chalcogenide glass fiber manufacturing [10,11], eliminates crystallization issues during fiber drawing process. Fabrication method for the production of optical fibers in the Ga2O3-GeO2-BaO-K2O glass system is detailed and fiber losses are presented
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