论文标题
多模纤维放大器中光束自我清洁的数值分析
Numerical analysis of beam self-cleaning in multimode fiber amplifiers
论文作者
论文摘要
最近的实验结果报道了光束自我清洁的观察，或者更普遍地，在活性多模纤维中重塑了非线性光束。在这项工作中，我们通过考虑由带有均匀YB掺杂的分级多模纤维制成的二极管泵浦信号放大器的理想情况，对这些过程进行了数值分析。模拟确认信号的光束清洁即使在放大纤维中也可能发生，即没有光束能量节约。此外，我们展示了由自我成像过程定期产生的局部信号强度最大值如何影响掺杂原子的种群反转，并在局部饱和放大器的增益。
Recent experimental results have reported the observation of beam self-cleaning or, more generally, nonlinear beam reshaping in active multimode fibers. In this work we present a numerical analysis of these processes, by considering the ideal case of a diode-pumped signal amplifier made of a graded-index multimode fiber with uniform Yb doping. Simulations confirm that beam cleaning of the signal may take place even in amplifying fibers, that is the absence of beam energy conservation. Moreover, we show how the local signal intensity maxima, which are periodically generated by the self-imaging process, may influence the population inversion of the doping atoms, and locally saturate the amplifier gain.
