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Long single-mode and multimode fluoride glass fibres with core-clad structure are fabricated for the first time by the double-crucible technique. 500 m-long single-mode fibre and 700 m-long multimode fibre are obtained using ZrF4-BaF2-NaF-LaF3-AlF3 core and ZrF4-BaF2-NaF-LaF3-AlF3-HfF4 clad glasses.
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Tokiwa et al. (1985) studied this question.
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