Abstract
Many properties need to be considered in deciding whether a particular glass will be suitable for a given commercial application. To make heavy metal fluoride (HMF) glass fibres, the resistance of the glass to crystallization during fabrication is of prime importance and this is linked in turn to the viscosity-temperature behaviour. At the same time other properties, such as the refractive index and dispersion, thermal expansion coefficient, chemical durability and strength, must also be optimized to allow manufacture of fibres with appropriate waveguiding characteristics and able to survive a range of operating conditions. As a result considerable effort has gone into composition development since the initial identification of fluorozirconate glasses as potential materials for infrared transitting fibres. Drexhage [1] and Tran et al. [2] have given comprehensive reviews of work in this field.
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