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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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Bibliographic Details
Published in:Inorganic materials 2007-04, Vol.43 (4), p.441-447
Main Authors: Churbanov, M. F., Shiryaev, V. S., Suchkov, A. I., Pushkin, A. A., Gerasimenko, V. V., Shaposhnikov, R. M., Dianov, E. M., Plotnichenko, V. G., Koltashev, V. V., Pyrkov, Yu. N., Lucas, J., Adam, J. -L.
Format: Article
Language:English
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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.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168507040206