We demonstrate the almost complete 2 µm laser power recovery of the gamma-ray-irradiated thulium (Tm)-doped silica fiber under deuterium loading. The optical–optical slope efficiency and the cladding absorption spectra of the Tm-doped fiber with gamma-ray irradiation and deuterium treatment have been measured for comparison. It was found that the slope efficiency of the irradiated Tm-doped fiber could be recovered to 96.1% of the pristine after deuterium bleaching, which significantly degraded from 60.7% to 25.3% after irradiation. Meanwhile, the additional absorption attenuation of the irradiated Tm-doped with ${\mathrm{D}}_2$ treatment completely vanished. Based on the comprehensive comparison of cladding absorption spectra, the probable mechanism of the deuterium bleaching effect on irradiated Tm-doped fiber has also been discussed.

中文翻译：

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Tm掺杂硅纤维对氘的自由基无源漂白

我们证明了在氘负载下，γ射线掺杂的（（Tm）掺杂的石英纤维几乎可以完全恢复2 µm的激光功率。为了进行比较，已经测量了掺有γ射线和氘处理的掺有Tm的光纤的光学斜率效率和包层吸收光谱。研究发现，经氘漂白后，经辐照的掺Tm光纤的斜率可恢复到原始的96​​.1％，经辐照后，斜率从60.7％显着降低到25.3％。同时，掺杂Tm的辐照Tm的附加吸收衰减${\mathrm{d}}_{\mathrm{2个}}$治疗彻底消失了。在对包层吸收光谱进行综合比较的基础上，还讨论了氘对辐照掺Tm光纤的漂白作用的可能机理。