New fluoroindate glass compositions

New multicomponent InF 3 -based bulk glasses have been investigated. The molar composition of the base glass is 28% InF 3 –20% ZnF 2 –16.5% BaF 2 –12% GaF 3 –9% PbF 2 –6% NaCl–5% SrF 2 –3% CaF 2 –0.5% PrF 3 . A number of variations of the base glass were prepared and their refractive indices and densities measured. Resistance to crystallization allowed the preparation of large pieces of the base glass. The infrared and Raman spectra show that the base composition has a longer wavelength multiphonon edge at 10 μm and a phonon energy of 509 cm −1 , in comparison with 8 μm and 574 cm −1 for ZBLAN, which reveals that the present glasses have a lower phonon energy and a greater transparency in the infrared than ZBLAN. Reduction of PbF 2 concentration in the base composition provided glasses with smaller refractive indices than the base glass.