Glass fiber devitrification

Glass devitrification Formation of crystals (seeds) in a glass melt, usually occurring when the melt is too cold. These crystals can appear as defects in glass fibers. 

Fluoride glasses are known for being prone to hydrolysis and devitrification. Therefore, whatever the procedure, great care must be taken during all the stages of optical fiber preparation in terms of chemical purity of the starting materials, environment control and heating procedures. 

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