For fiber-optic mid-infrared bio- and chemical-sensing, Ge–Sb–Se glass optical fibers are more attractive than Ge–As–Se because of: (i) lowered toxicity and (ii) lower phonon energy and hence transmission to longer wavelengths, with potential to reach the spectral “fingerprint region” for molecular sensing. There is little previous work on Ge–Sb–Se fibers. Here, fibers are fabricated from two glass compositions in the Ge_xSb₁₀Se_90−x atomic (at.) % series. Both glass compositions are of similar mean-coordination-number, lying in the overconstrained region, yet of different chemical composition: stoichiometric Ge₂₅Sb₁₀Se₆₅ at. % and non-stoichiometric Ge₂₀Sb₁₀Se₇₀ at. %. Thermal analysis on bulk glasses has previously shown that the former exhibited the maximum glass stability of the series. However, during fiber-drawing of Ge₂₅Sb₁₀Se₆₅ at. %, the preform tip is found to undergo surface-devitrification to monoclinic GeSe₂ alone, the primary phase, no matter if the preform is an annealed, as-melted rod or annealed, extruded rod. The heating rate of the preform-tip to the fiber-drawing temperature is estimated to be up to ~100°C/min to ~490°C. Lower heating rates of 10°C/min using thermal analysis, in contrast, encourage crystallization of both Sb₂Se₃ and GeSe₂. The non-stoichiometric: Ge₂₀Sb₁₀Se₇₀ at. % composition drew successfully to low optical loss fiber, no matter whether the preform was an annealed, as-melted rod or annealed, extruded rod.

中文翻译：

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Ge-Sb-Se玻璃中与光纤制造有关的结晶成分依赖性

对于光纤中红外生物和化学传感，Ge-Sb-Se玻璃光纤比Ge-As-Se更具吸引力，因为：（i）毒性降低，（ii）声子能量降低，因此可以传输到更长的波长，有可能到达光谱“指纹区”以进行分子传感。以前关于Ge-Sb-Se纤维的工作很少。在此，纤维是由两种以Ge _x Sb ₁₀ Se _{90- x}原子（原子）％含量的玻璃成分制成的。两种玻璃均具有相似的平均配位数，位于超约束区域，但化学组成不同：化学计量为Ge ₂₅ Sb ₁₀ Se ₆₅ at。％和非化学计量的Ge ₂₀锑₁₀硒₇₀ at。％。以前对散装玻璃进行的热分析表明，前者表现出该系列产品最大的玻璃稳定性。然而，在Ge ₂₅ Sb ₁₀ Se ₆₅ at的纤维拉伸过程中。％，发现预型件尖端仅对单相GeSe ₂（主相）进行表面失透，而不管预型件是退火的，熔化的棒还是退火的，挤压的棒。预制棒尖端对纤维拉伸温度的加热速率估计高达〜100°C / min至〜490°C。相比之下，通过热分析将升温速率降低至10°C / min ，则会促进Sb ₂ Se ₃和GeSe _2的结晶。非化学计量比：Ge ₂₀ Sb ₁₀ Se ₇₀ at。无论预成型坯是退火，熔化的棒还是退火，挤出的棒，％组成都成功地吸引到低光损耗纤维上。