TREATING GLASS COMPOSITIONS

摘要

TREATING GLASS COMPOSITIONS A process is disclosed for treating a halide, e.g. fluoride, glass composition, characterised by contacting a melt of the composition with dry oxygen. Oxygen, simply on contact with a fluoride glass melt, converts transition metals, e.g. from Fe(II) to Fe(III), from one stable state to another and thereby reduces loss at transmission wavelengths in optical fibre, e.g. the loss of 2.6 .mu.m attributable to Fe(II).