A wide variety of transparent MO glasses, crystals, and transparent glass–ceramics containing rare earth (RE) ions such as Tb 3+, Dy 3+, Pr 3+, and Gd 3+ have been investigated and are considered promising materials for photonics and spintronics 6, 7, 8. MO materials have been applied as modulators, as optical isolators, and as magneto-optical fiber sensors 3, 4, 5. Magneto-optical (MO) materials based on the Faraday effect have been increasingly studied for use in new technologies 1, 2. The V B values at 5 nm for the optical fiber containing 8 mol% of Tb 4O 7 were − 110.2 and − 9.5 rad T −1 m −1, respectively, while the optical loss at around 880 nm was 6.4 dB m −1. The maximum V B values obtained at 6 nm for the glass with x = 18 mol% were -128 and − 17.6 rad T −1 m −1, respectively. The magneto-optical properties and the paramagnetic behaviors of the glasses were investigated using Faraday rotation experiments.
#Glass preform windows
The UV–Vis spectra of the glasses showed Tb 3+ electronic transitions and optical windows varying from 0.4 to 1.6 μm. An optical fiber was manufactured by a fiber drawing process. All the samples presented excellent thermal stability against crystallization (ΔT > 100 ☌). Morphological analysis (HR-TEM) of the sample with the highest concentration of Tb 3+ ions confirmed the homogeneous distribution of Tb 3+ ions and the absence of nanoclusters. This work reports on the structural and MO properties of a new glass composition based on (100 − x)(41GeO 2–25B 2O 3–4Al 2O 3–10Na 2O–20BaO) − xTb 4O 7. It uses closed circuit control logic to enable the machine to perform safely.New glass compositions containing high concentrations of Tb 3+ ions were developed aiming at the production of magneto-optical (MO) fibers. Each oven can be loaded and unloaded independent of the other ovens.Ī PLC is used to control the actuators. Preforms are loaded and unloaded automatically. In case of breakage, the system allows for the broken material to be removed. The outer surface of the preform is protected from contamination. The housing is a stainless steel cylinder. The ovens consist of 3 cylindrical units for core soaking and 5 cylindrical units for clad soaking. The small frame sits on a table on the Y-axis and Z-axis linear rails. The top section contains the vertical actuator and gripper. The frame consists of two parts, a large base section which contains the ovens and load station, and a top section for loading. The structure is manufactured for strength and flexibility. The Preform Soaking Oven systems are comprised of four main parts, a main structure, ovens, a preform movement system, and a process control subsystem. If the Preform Soaking Oven is not used, it could take days or even weeks for the excess gas to escape at ambient temperature.Ī further benefit of using the Preform Soaking Oven is a potential reduction in draw ramp up time since the glass preforms can be brought to the draw furnace already warm, reducing the time to bring the preform up to temperature at the draw tower.Įach Preform Soaking Oven is configured with 3 or 5 ovens which operate independently of each other.
Excess gas which is invisible to the naked eye, can cause bubble formation in the glass resulting in fiber breaks during the draw process, if not removed from the glass preform. This system is used to heat glass preforms after they have been sintered enabling excess gas still trapped in the preform after sintering to escape. The Preform Soaking Oven System is designed and manufactured by ASI/Silica Machinery, LLC.
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