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光纤放大器在辐照环境中具有良好的应用前景, 而模式不稳定(transverse mode instability, TMI)效应则是制约光纤放大器功率提升的重要因素. 因此, 针对辐照效应对于掺镱光纤放大器TMI阈值的影响, 开展了理论研究. 通过将辐致损耗引入光纤放大器的TMI理论模型, 率先给出了考虑辐照效应的TMI阈值表达式, 探讨了TMI阈值随辐射剂量的变化规律, 研究表明: 辐照效应对于TMI阈值的影响, 不仅与光纤的抗辐照性能有关, 还与光纤放大器的增益系数有关. 增益系数的增大, 会减缓TMI阈值随辐射剂量的衰减, 但也会导致TMI阈值的整体下降. 通过对比辐照效应对于TMI阈值和输出功率的影响, 结果发现, TMI阈值随辐致损耗衰减更快. 这也使得TMI效应成为辐照条件下光纤放大器输出功率的限制因素. 相关研究结果, 对于辐射条件下光纤放大器的设计及应用研究具有指导意义.
Yb-doped fiber amplifiers and their applications in radiation environments have become more and more attractive in recent years. However, the radiation effect will cause damage to the Yb-doped fibers, which can give negative effect on the output properties of Yb-doped fiber amplifiers. In this work, the influence of radiation effect on the transverse mode instability (TMI) of Yb-doped fiber amplifier is studied. TMI can couple the single light from the fundamental mode to high-order mode, thereby degenerating the beam quality of fiber amplifier. TMI is considered a key limitation of power up-scaling of fiber amplifiers. In this work, the radiation effect on the TMI is studied theoretically, and a formula of TMI threshold is presented by taking the radiation-indued attenuation (RIA), the most important radiation effect for the TMI, into account. The formula is deduced by introducing the loss of signal light induced by RIA into the formerly reported TMI-threshold formula which can be obtained by analyzing the linear stability of the numerical model studying the TMI. Then, the relationship between the TMI and radiation dose is also given with the help of Power-Law describing the relationship between the RIA and radiation dose. With the formula, the variations of TMI threshold with the radiation dose and RIA are studied. It is found, as expected, that the TMI threshold decreases monotonically with the increase of RIA or radiation dose. Nevertheless, it is unexpectedly found that, to some extent, the gain coefficient of fiber amplifiers will also affect the radiation effect on TMI threshold. The results reveal that the increase of gain coefficient will lower the sensitivity of TMI threshold to the radiation dose. However, it is also implied that the gain coefficient cannot be too large because it can also make the TMI threshold lowered. Therefore, in order to maintain a high TMI threshold in a radiation environment, sufficient radiation resistance of Yb-doped fiber is essential. Because the RIA can affect not only the TMI threshold but also the output power or efficiency of Yb-doped fiber amplifier, the comparison between two effects of RIA is also discussed. It is found that the threshold of TMI is more sensitive to the radiation than to the output power or efficiency (see the figure attached below), which means that the TMI can exist in the irradiated Yb-doped fiber amplifier, although the output power is reduced because of RIA. This result can be verified by the experimental observation reported formerly. As a result, TMI can become a key limitation to the output power of Yb-doped fiber amplifier in radiation environments. The relevant results can provide significant guidance for the applications of Yb-doped fiber amplifiers in radiation environments. 
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Keywords:
- fiber amplifier /
- radiation effect /
- transverse mode instability /
- radiation-induced attenuation
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图 1 归一化TMI阈值随辐射剂量D、系数C1和f的变化, 泵浦光和信号光波长分别为976 nm和1080 nm, 增益系数gsat为2 dB/m, f取值分别为0.5 (a), 0.7 (b), 0.9 (c), 1.1 (d)
Fig. 1. Variation of normalized TMI threshold with radiation dose D、 coefficients C1 and f, the pump wavelength and signal wavelength are 976 nm and 1080 nm respectively, and the gain coefficient gsat is 2 dB/m. The value of coefficient f are 0.5 (a), 0.7 (b), 0.9 (c), and 1.1 (d), respectively.
图 2 归一化TMI阈值随辐射剂量D、系数C1和f的变化, 泵浦光和信号光波长分别为976 nm和1080 nm, 系数f为0.7, 增益系数取值分别为1 dB/m (a), 3 dB/m (b), 5 dB/m (c), 10 dB/m (d)
Fig. 2. Variation of normalized TMI threshold with radiation dose D, coefficients C1 and f. The pump wavelength and signal wavelength are 976 nm and 1080 nm respectively, and the coefficient f is 0.7. The value of gain coefficient are 1 dB/m (a), 3 dB/m (b), 5 dB/m (c), and 10 dB/m (d), respectively.
图 3 不同增益系数对应的TMI阈值随D的变化 (a) C1 = 0.002, f = 0.5; (b)C1 =0.012, f = 0.9, 纤芯直径为30 μm
Fig. 3. Variation of TMI threshold with D corresponding to various gain coefficient: (a) C1 = 0.002, f = 0.5; (b) C1 = 0.012, f = 0.9, the core diameter is 30 μm.
图 4 归一化TMI阈值(实线、虚线和点划线)及输出功率比值(空心圆点)随辐致损耗的变化 (a)光纤长度为20 m; (b)光纤长度为10 m
Fig. 4. Variation of normalized TMI threshold (solid, dashed, and dotted) and output power ratio (hollow dots) with RIA: (a) Yb-doped fiber length is 20 m; (b) Yb-doped fiber length is 10 m.
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