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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Growth kinetics and thermal annealing of UV-induced H-bearing species in hydrogen loaded germanosilicate fibre preforms
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Growth kinetics and thermal annealing of UV-induced H-bearing species in hydrogen loaded germanosilicate fibre preforms

机译：氢负载锗硅酸盐纤维预成型坯中紫外线诱导的含氢物种的生长动力学和热退火

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The cores of optical fibre preforms have been exposed to UV pulsed light at 244 nm after molecular hydrogen loading under high pressure. The UV-induced changes in the sample's infrared absorption spectra have been monitored during the UV exposure by means of Fourier transform spectroscopy. The analysed spectral range spanned from 580 to 5200 cm~(-1). The kinetics of creation of hydroxyl, hydride and molecular water species has been investigated. The initial rate of hydride formation is similar to those corresponding to the formation of the two other species. However, the process of hydride generation is almost saturated after exposure of the glass to 10~5 pulses of UV light, while concentrations of hydroxyl and molecular water continue to grow slightly. On the other hand, the dynamics of hydroxyl or molecular water species absorption growth resulting from exposure to UV light at a fluence per pulse of 30 mJ/cm~2 is significantly slower than those at 140 mJ/cm~2. This result differs from what is observed when recording the dynamics of infrared absorption caused by the hydride since the difference between the dynamics recorded using those two fluences are scarcely significant. Periodic exposure of samples to a burst of 10~5 light pulses followed by H_2 reloading has shown that availability of molecular hydrogen plays a significant role in the growth dynamics of hydroxyls. The orders of magnitude changes in the UV-induced species concentrations have been estimated from the UV-induced infrared spectra. Thirty-minute isochronal annealing experiments reveal that the concentration of OH-bearing species is reduced by a factor of two after the step of annealing temperature at 600 deg C. At this step, the hydrides are almost completely bleached, whereas the molecular water concentration dramatically decreases after 200 deg C. The implications of these various observations are discussed in relation with the current models of photosensityivity in H_2-loaded germanosilicate glasses.
机译：在高压下施加分子氢后，光纤预制棒的纤芯已暴露在244 nm的紫外线脉冲光下。在紫外线照射过程中，通过傅立叶变换光谱法监测了紫外线诱导的样品红外吸收光谱的变化。分析的光谱范围从580到5200 cm〜（-1）。已经研究了生成羟基，氢化物和分子水物种的动力学。氢化物形成的初始速率类似于对应于其他两种物质形成的速率。然而，在玻璃暴露于10〜5个紫外线脉冲后，氢化物的生成过程几乎已饱和，而羟基和分子水的浓度则继续略有增长。另一方面，在每脉冲通量为30 mJ / cm〜2的情况下，暴露于紫外光导致的羟基或分子水物种吸收增长的动力学要比140 mJ / cm〜2的动力学慢得多。该结果与记录氢化物引起的红外吸收动力学时观察到的结果不同，因为使用这两种通量记录的动力学之间的差异几乎没有显着性。样品定期暴露于10〜5个光脉冲中，然后再进行H_2重装，表明分子氢的可利用性在羟基的生长动力学中起着重要作用。从紫外线诱导的红外光谱中可以估算出紫外线诱导的物种浓度的数量级变化。 30分钟的等时退火实验表明，在600℃的退火温度步骤之后，含OH的物质的浓度降低了两倍。在此步骤中，氢化物几乎完全被漂白了，而分子水的浓度却大大降低了。 200摄氏度后温度会下降。结合H_2负载的锗硅酸盐玻璃中的光敏性当前模型，讨论了这些不同观察的含义。

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