Effect of draw temperature and flame polishing on birefringence of silica glass fiber
Effect of draw temperature and flame polishing on birefringence of silica glass fiber
复制标题
拉制温度和火焰抛光对石英玻璃纤维双折射率的影响
DOI：
10.1111/ijag.16623
复制
发表时间：
2023
影响因子：
2.1
通讯作者：
Tomozawa, Minoru
中科院分区：
文献类型：
--
作者：
Hausmann, Bronson D.;Hawkins, Thomas W.;Ballato, John;Tomozawa, Minoru
最近发展起来的高分辨率双折射测量方法被用来区分两种不同水分含量的石英玻璃的表面和内部双折射随拉伸温度和初始表面条件的变化。纤维在无水的氩气环境中使用石墨加热元件进行拉伸。研究发现，在较低温度下拉伸的纤维会产生更大的内部双折射，这与之前的报告一致。此外，在低水二氧化硅玻璃的情况下，通过氢氧混合火焰抛光，并在较低的温度下拉伸成纤维，在拉拔时会产生明显的表面压应力。这种压应力可能是石英玻璃在拉伸过程中在水存在的情况下发生表面应力松弛的结果。在内部羟基杂质浓度较高的石英玻璃中，在相同的拉丝条件下，内部双折射和表面应力松弛显著降低。这种应力响应的表征提供了对常见加工技术的影响的洞察，以及预制棒加工对于一致的纤维生产的重要意义。
Recently developed methods for high resolution birefringence measurement have been applied to distinguish between the surface and interior birefringence of silica glass fibers as a function of drawing temperature and initial surface condition for two types of silica glass with different water contents. Fibers were drawn in a water‐free argon environment using graphite heating elements. It was found that fibers drawn at lower temperatures resulted in greater, interior birefringence, in agreement with previous reports. Additionally, it was found that in the case of low‐water silica glass, flame polishing via oxygen–hydrogen mixture and drawn into fibers at lower temperature resulted in significant surface compressive stress upon drawing. This compressive stress may be the result of surface stress relaxation in silica glass that occurs in the presence of water during fiber drawing. In silica glass that contains greater internal hydroxyl impurity concentrations, the interior birefringence as well as the surface stress relaxation was significantly reduced under the same fiber drawing conditions. Characterization of such stress responses provides insight into the effects of common processing techniques as well as impresses the significance of preform processing for consistent fiber production.