SURFACE TREATMENTS FOR OPTICAL FIBRE PREFORMS

摘要

Halide fibres are protected by coatings up to 2 mu m thick of chalcogenide glasses, eg glasses based on compounds of S, Se or Te with Ge or As. The coatings are deposited on the fibre preform by ion deposition sputtering. Preferably the preform is etched by directing a stream of inert ions at it. Most suitably the etching immediately precedes the coating.