Abstract
A very small number of multicomponent fluoride melts are associated with the formation of stable vitreous materials. When these unconventional glasses are sufficiently resistant towards devitrification, they can be shaped into sophisticated optical objects such as optical fibres. These original IR waveguides have found practical applications in remote spectroscopy, laser surgery and thermal imaging. Fluoride glasses also represent a unique optical host for rare earth ions, the low phonon energy of the lattice enabling high efficiency in laser emission and the observation of up-conversion phenomena. Very efficient blue-green fibre-laser emission and optical amplification for telecommunications have been recently demonstrated and are under development.
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