伽马射线辐照对掺铅石英光纤的磁光特性影响

研究了伽马射线辐照对掺铅石英光纤磁光特性的影响。实验结果表明: 掺铅石英光纤样品辐照前, 在660、808、980、1310和1550 nm波长处的费尔德常数分别为3.093、1.676、1.240、0.705和0.538 rad/(T?m), 均高于单模光纤的费尔德常数, 且费尔德常数随着波长的增加而减小, 尤其在 660 nm, 相比较单模光纤, 掺铅石英光纤样品费尔德常数提高了20.82%。经伽马射线辐照后, 掺铅石英光纤样品的费尔德常数随着辐照剂量的增加而增大, 尤其在 5 kGy 剂量, 其费尔德常数增加了41.94%, 而单模光纤仅增加了33.04%。掺铅石英光纤通过掺杂及辐照的手段提高了费尔德常数, 在大电流传感领域具有重要意义。

Gamma-ray Radiation on Magneto-optical Property of Pb-doped Silica Fiber

Effect of gamma-ray radiation on magneto-optical properties of Pb-doped optical silica fiber before and after irradiation were investigated. The experiment results indicated that Verdet constants of the fiber samples at 660, 808, 980, 1310, and 1550 nm were 3.093, 1.676, 1.240, 0.705, and 0.538 rad/(T?m), respectively, larger than these of single mode fiber. Verdet constants decreased with the increase of wavelength. It increased by 20.82% at 660 nm. After the fiber samples being irradiated from 0.8 kGy to 5 kGy, Verdet constants of Pb-doped silica fibers increased with the increase of radiation dose. Especially, Verdet constant of Pb-doped silica fiber irradiated at 5 kGy is 41.94% larger than that of the un-radiation treated fiber, and increased by 33.04% for SMF with the same doses treatment. Verdet constant of the Pb-doped silica fiber can be increased by doping and radiation methods, which is of great significance in the field of current sensing.