Abstract
Recently zirconium fluoride-based glasses have emerged as leading candidates for ultralow-loss fiber applications in the mid-IR region because of their superior glass-forming ability relative to many other halide glasses. However, compared with the silica-based glass systems, the fluorozirconate glasses generally exhibit an extremely narrow working range of only ~75°C and a much larger change in shear viscosity with respect to small temperature fluctuations in the fiber drawing regime.1 These departures from the oxide glass behavior can result in severe devitrification or frequent fiber rupture during the drawing process. To suppress the crystallization tendency and the high activation energy for viscous flow of the zirconium fluoride glasses, it is necessary to incorporate modifiers such as AIF3, LiF, NaF, PbF2, and SbF3. Multicomponent zirconium fluoride-based optical fiber glass systems currently under extensive investigation include ZrF4-BaF2- LaF3-AIF3-LiF-PbF2.1 ZrF4-BaF2-GdF3-AIF3- SbF3,2 ZrF4-BaF2-LaF3-AIF3-NaF,3 and ZrF4- HfF4-BaF2-ThF4-LaF3-AIF3-LiF-NaF.4
© 1983 Optical Society of America
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