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High-purity As-S-Se and As-Se-Te glasses and optical fibers
We describe a procedure for the preparation of As-S-Se and As-Se-Te glasses with low contents of gas-forming impurities (hydrogen, oxygen, and carbon) via melting of extrapure-grade elements in an evacuated silica ampule and purification of the melt by chemical distillation. The impurity concentrati...
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Published in: | Inorganic materials 2007-04, Vol.43 (4), p.441-447 |
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Main Authors: | , , , , , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | We describe a procedure for the preparation of As-S-Se and As-Se-Te glasses with low contents of gas-forming impurities (hydrogen, oxygen, and carbon) via melting of extrapure-grade elements in an evacuated silica ampule and purification of the melt by chemical distillation. The impurity concentrations in the glasses thus prepared have been reduced to the following levels: hydrogen, < 0.02; oxygen, 0.2; carbon, < 0.02; silicon, < 0.4 ppm by weight. Using the double-crucible method, we have fabricated glass fibers with various ratios of the core and cladding diameters (1: 25 to 9: 10), protected with a tetrafluoroethylene/1,1-difluoroethylene copolymer coating, which have an average bending strength of 0.5-1 GPa. The minimal optical losses are 150 dB/km at 6.6 mum in multimode As-Se-Te glass fibers and 60 dB/km at 4.8 mum in As-S-Se glass fibers. The effect of microinhomogeneities in the melt on the optical performance of arsenic sulfoselenide glass fibers fabricated by the double-crucible method is examined. |
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ISSN: | 0020-1685 1608-3172 |
DOI: | 10.1134/S0020168507040206 |