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摘要:面向2 μm掺铥光纤 器的空间应用，本文针对典型商用掺铥光纤(TDF)开展了γ射线辐照效应实验研究。利用 60Co源放射的γ射线，对由5段同批次Nufern公司SM-TDF-10P/130-HE型TDF样品搭建的2 μm光纤 器进行总剂量为9.0 krad (Si)、剂量率为0.5~3.0 rad/s的辐照效应在线测试。结果表明，TDF的出光性能在辐照过程中出现了显著衰减，衰减幅度随着剂量率的上升而增大。通过对TDF样品在辐照前和辐照后的吸收光谱进行对比测试，观察到在经过总剂量9 krad (Si)的γ射线辐照后，TDF对793 nm泵浦光的吸收峰接近消失。对前述经历γ辐照之后的TDF样品进行2 h的793 nm泵浦光漂白实验测试，未见其出现性能恢复现象。可见，面向空间应用的该典型掺铥光纤需大力提高耐空间辐射性能。Abstract:In order to realize the space application of 2 μm thulium-doped fiber laser, the experimental study of γ-ray irradiation effect is carried out for typical commercial Tm-doped fiber(TDF). Using a gamma ray of 60Co, the irradiation effect of a total dose of 9.0 krad(Si) and a dose rate of 0.5-3.0 rad/s is performed on a 2 μm fiber laser constructed from 5 groups of the same TDF samples batch of SM-TDF-10P/130-HE produced by Nufern. The measurement results show that the light emission performance of TDF greatly attenuated during irradiation, and the attenuation amplitude increases with the increase of the dose rate. By comparing the absorption spectra of the TDF sample before and after irradiation, it is found that the absorption peak of the 793 nm pump light disappeared with the irradiation of the total dose of 9 krad(Si). The above-mentioned irradiated TDF sample is subjected to a 793 nm pump photobleaching test for 2 hours, and no performance recovery is observed. It can be seen that the space radiation performance of typical Tm-doped fiber has to be improved for space applications.
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Key words:
- Tm-doped fiber/
- spatial radiation/
- gamma-ray irradiation effect
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图 1掺Tm光纤γ射线辐照效应测试实验装置
Figure 1.Experiment setup to measure the γ-ray irradiation effect of Tm-doped optical fibers
图 3TDF在辐照前(曲线a)和辐照后(曲线b)的吸收光谱
Figure 3.Absorption spectra of Tm-doped fibers before(curve a) and after(curve b) irradiation
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