抗辐射保偏光纤的制备及其特性研究

通过对保偏光纤进行光漂白与低温相结合处理的方式，来提高光纤的抗辐射性能。保偏光纤再经过1.0 kGy的高剂量预辐照处理后，其损耗会明显增大。随后采用980nm的激光对光纤进行光漂白处理,其损耗并没有发生明显变化。但是，处理后的样品在小剂量辐照条件下其光纤传输呈现先减小后增大的趋势。对于通过液氮进行冷处理的预辐照样品，其光纤传输损耗得到明显的降低，同时光纤经过小剂量辐照后的损耗同样也具有先减小后增大的现象。最后，将两种处理方式相结合，一方面可以有效地降低预辐照光纤的传输损耗，另一方面也使得保偏光纤在小剂量辐照的条件下，使其传输损耗具有减小的趋势，大大提高了保偏光纤在小剂量辐照条件下的抗辐照特性。

Preparation and Characteristics of Radiation-Resistance Polarization-Maintaining Fiber

The radiation-resistant performances of the polarization-maintaining fiber are improved by the photo-bleaching and low-temperature treatment method. After the high-dose irradiation of the precursor fiber is up to 1.0 kGy, the transmission loss will be increased significantly. The photo-bleaching treatment is carried out by a 980 nm laser for the irradiated fiber, and the transmission loss of the treated sample is almost the same as that of the pre-irradiated samples. However, the transmission spectra are first decreased and then increased under low dose irradiation conditions. For pre-irradiated samples treated with liquid nitrogen at low-temperature, the loss is decreased obviously. Moreover, the loss of treated fiber also is decreased first and then increased under the low-dose irradiation conditions. Finally, combining the low-temperature treatment with the photo-bleaching method, the transmission loss of the polarization-maintaining fiber can be effectively reduced, compared to the untreated fiber. Moreover, the transmission loss of the treated polarization-maintaining fiber is also reduced first and then increased under the condition of small dose irradiation. As a result, the method using the low-temperature treatment and photo-bleaching method has greatly improved the irradiation-resistant characteristics of polarization-maintaining fibers under the low-dose irradiation conditions.