Fluorophosphate glass

Fluorophosphate glass is a class of optical glasses composed of metaphosphates and fluorides of various metals. It is a variant of phosphate glasses.

Some fluorophosphate glasses are used as low dispersion glasses. Some show anomalous partial dispersion. One such glass is composed of Ba(PO₃)₂, Al(PO₃)₃, AlF₃, and alkaline earth fluorides MgF₂, CaF₂, SrF₂, and BaF₂, with possible addition of titanium, sodium, potassium, and/or hydrogen. The components by wt.% are 0.5-3% Mg, 8-10% Ca, 12-20% Sr, 9-12% Ba, 7-9% Al, 5-9% P, 8-12% O, and 35-38% F.

Some doped fluorophosphate glasses are used in laser technology. They are attractive here for their small refractive index nonlinearity. Rare earth elements are popular dopants. One of the applications is for optical amplifiers.

Exotic dopants like fullerenes and quantum dots can be employed.

Tungsten-doped tin-fluorophosphate glasses (SnO-SnF2-P2O5) can be used for hermetic sealing of organic light-emitting diodes and other devices.

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