Radiation-Induced Mode Instability Threshold Degradation and Self-Recovery in High-Power Fiber Amplifiers Under γ-radiation
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摘要: 针对高功率光纤放大器在γ射线辐照环境下出现的辐致模式不稳定性效应，基于光纤辐致损耗机理与线性稳态分析方法，系统研究了γ辐照对模式不稳定阈值的影响及自恢复机制。实验结果表明，当辐致模式不稳定效应发生时，放大器的输出功率存在着剧烈波动。随着泵浦电流的逐渐增加，输出功率呈现出相似的波动趋势，并随着出光时间依次经历快速下降、缓慢下降、缓慢上升和达到亚稳态4个阶段。在每个泵浦电流下，最高与最低输出功率之间的差值均稳定在辐照前输出功率的29.7%～39.1%范围。通过分析输出激光的频域信号，进一步验证了辐致模式不稳定的自恢复效应。本文的研究结果为高功率光纤激光器在辐照环境下TMI阈值的变化特性及自恢复设计提供了理论和实验参考，具有较大的研究意义和应用价值。Abstract:
Background The performance of high-power fiber amplifiers operating in radiation environments is severely degraded by the radiation-induced mode instability (R-TMI) effect. A deep understanding of its degradation and self-recovery mechanism is therefore crucial for practical applications.Purpose This study aims to investigate the influence of γ-ray radiation on the mode instability threshold of a high-power fiber amplifier and to elucidate the underlying self-recovery mechanism of the R-TMI effect.Methods Experimental investigations were conducted on a fiber amplifier subjected to γ-ray radiation. The output power characteristics and the frequency-domain signals of the output laser were monitored and analyzed under varying pump current conditions to study the dynamics of the R-TMI effect.Results The experimental results reveal that the onset of the R-TMI effect induces significant fluctuations in the output power. As the pump current is gradually increased, the output power consistently evolves through four distinct stages over time: rapid decline, slow decline, slow rise, and finally metastable state. At each specific pump current level, the power fluctuation range, defined as the difference between the maximum and minimum output power, remains stable within 29.7% to 39.1% of the pre-radiation output power. Furthermore, frequency-domain analysis of the output laser signal provided evidence supporting the existence of a self-recovery effect in R-TMI.Conclusions The study characterizes the variation of the TMI threshold and the subsequent power dynamics under radiation. The self-recovery behavior offers valuable theoretical and experimental references for the design and mitigation of R-TMI effects in high-power fiber lasers intended for use in radiation environments. -
图 2 在伽马辐照前光纤放大器的输出性能。
Figure 2. Output performance of the fiber laser amplifier before gamma radiation
图 3 伽马辐照前后，光纤放大器的输出功率随出光时间的对比情况。
Figure 3. Comparison of the output power of the fiber laser with respect to the laser output time before and after gamma radiation
图 4 R-TMI阈值自恢复的定量分析。
Figure 4. Quantitative research of the recovery of R-TMI threshold
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