Spectral UV losses in 355 nm pulsed laser delivery system at low temperatures
Spectral UV losses in 355 nm pulsed laser delivery system at low temperatures
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低温下 355 nm 脉冲激光传输系统中的光谱 UV 损失
DOI：
10.1016/j.jnoncrysol.2013.04.042
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
E. Takala
中科院分区：
文献类型：
--
作者：
J. Heimann;C. Gonschior;K. Klein;G. Hillrichs;E. Takala
以高羟基聚酰亚胺涂覆全硅多模光纤为传输系统，研究了355 nm脉冲激光在低温77℃(液氮)和室温下的光降解和光恢复特性。为了进行比较，测量了在重金属灯的光传输过程中产生的紫外光诱导的光纤损耗。对于这些完全不同的光源，在这些研究中使用的两种温度下，缺陷产生的效率(包括在214 nm和265 nm处的紫外光吸收)显着不同。在77℃时，被测试的高羟基光纤在214 nm处的紫外光损耗显著降低，而在265 nm处的相同损耗显著增加。此外，当光纤从77K升温到室温时，这两种损耗的值都会迅速变化。观察到的214 nm紫外光诱导吸收随温度变化的生长动力学被认为是由至少两种不同的缺陷产生机制解释的。
For a delivery system using high OH polyimide coated all-silica multimode fibers the photo degradation and recovery were investigated for 355 nm pulsed laser radiation at a cryogenic temperature of 77 K (liquid nitrogen) and at room temperature, as reference. For comparison, UV-induced fiber losses generated during light transportation of a deuterium lamp were measured. For these quite different light sources the efficiency of defect generation including UV-induced optical absorption at 214 nm and at 265 nm is significantly different at both temperatures used in these studies. At 77 K, the UV-induced optical loss at 214 nm is significantly reduced, while the same loss at 265 nm is increased, for the tested high OH fibers. In addition, the values of both losses are rapidly changed when the fiber is warmed up from 77 K to room temperature. The observed temperature dependent growth kinetics of UV-induced absorption at 214 nm is considered to be explained by at least two different mechanisms of defect generation.