New multicomponent fluoride glasses with low critical cooling rates for optical fibers

The Zr - free fluoride glass termed BIZYbT and based on the combination of Baryum, Indium, Zinc, Ytterbium and Thorium fluorides hasbeen optimized in orderto decrease thecriticalcoolingrate and make this glass suitablefor fiberdrawing. The lowest value of 5°C/mn has been obtained and is comparable to the classical ZBLAN fluoride glass.