掺Er3+光纤的γ射线辐射特性

本文研究掺Er³⁺光纤的γ射线辐射特性,发现在800到1600nm之间损耗都有显著的增加,有的增加800倍之多。光纤的γ射线辐照损耗特性具有β射线辐照类似的规律性。用γ射线的康普顿效应半定量地解释了这种类似性。对γ射线辐照损耗进行紫外线UV漂白,表明比热退火有更好的效果,能使损耗恢复50%。指出选用原子序数小的元素作光纤掺杂剂会有利于光纤抗辐照性能的提高。关键词：

EFFECTS OF γ IRRADIATION ON LOSS CHARACTERISTICS OF SINGLE MODE OPTICAL FIBERS DOPED WITH RARE EARTH Er3+

This papers presents the effects of Co-60 gamma irradiation on the absorption loss of single mode optical fibers doped with rare earth Er³⁺. The parameters of optical fibers are measured, prior to irradiation and after irradiation and UV bleaching. It has been found that absorption loss in the wavelength range of 0.80-1.60μm is greatly lager than those of unirra-diated fibers. Its increase law of absorption loss is similar to that of β ray irradiation. This similarity can be explained by Compton's effect. The induced loss can be partly bleached by UV, resulting in a better effect than heat annealing. In order to improve radiation resistivity, the elements with smaller atomic number should be selected as dopants in both core and cladding of the fiber.