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首页> 外文会议>Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications VI; Progress in Biomedical Optics and Imaging; vol.7 no.6 >High-OH fibers with higher stability in the UV-region
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High-OH fibers with higher stability in the UV-region

机译：高OH纤维在紫外线区域具有更高的稳定性

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摘要

For medical and analytical applications, step-index fibers based on synthetic silica are widely used. For special applications, high-OH all-silica fibers with excellent UV-transmission are commercially available, even at 180 nm. E'-centers with an absorption band around 215 nm, generated by the UV-light transported in these fibers, have to be taken into account. In addition to stable E'-centers, transient defects exist at room temperature, as well; therefore, the transmission at 215 nm wavelength depends on the operational conditions. The newly developed fibers with different diameters (from 100 nm to 600 nm core) will have a reduced defect concentration at 215 nm. In addition, the transient defect concentration has been reduced, too. The variation between the two power levels (dark, light) depends on the fiber diameter: the value is less than 0.3 dB/2m or 30 mAU/2m for large core fibers, one magnitude of order better than the comparable UVM-fiber described above. The hydrogen-content of the new fibers is negligible; therefore, the long-term behavior of these fibers, from 100 μm to 600 μm core diameter, is significantly better. In addition to low-power deuterium-lamps, the UV-damage of these fibers has been studied with high-power pulsed UV-lasers at 193 nm wavelength. Using the standard high-OH UV-fibers and UVM-fibers for comparison, the damage results will be discussed in detail. In addition, the established system for quality control of these UV-fibers will be described.
机译：对于医学和分析应用，基于合成二氧化硅的阶跃折射率纤维被广泛使用。对于特殊应用，即使在180 nm波长下，具有优异的紫外线透射率的高OH全二氧化硅纤维也可以买到。必须考虑在这些纤维中传输的紫外线在215 nm处吸收带的E'中心。除了稳定的E'中心外，室温下还存在瞬态缺陷。因此，在215 nm波长下的透射率取决于操作条件。新开发的具有不同直径（从100 nm到600 nm纤芯）的光纤在215 nm处的缺陷浓度将降低。另外，瞬态缺陷浓度也降低了。两种功率水平（暗，亮）之间的变化取决于光纤直径：对于大型芯光纤，该值小于0.3 dB / 2m或30 mAU / 2m，比上述可比的UVM光纤好一个数量级。新纤维的氢含量可忽略不计；因此，这些纤维从100μm到600μm纤芯直径的长期性能明显更好。除了低功率氘灯以外，还使用高功率脉冲UV激光器在193 nm波长下研究了这些光纤的UV损伤。使用标准的高OH紫外线纤维和UVM纤维进行比较，将详细讨论损坏结果。另外，将描述建立的用于这些紫外线纤维的质量控制的系统。

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