Numerical Investigation of Polarization-Dependent Ultrashort Pulse Amplification in Erbium-Doped Fluoride Fibers
Numerical Investigation of Polarization-Dependent Ultrashort Pulse Amplification in Erbium-Doped Fluoride Fibers
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DOI：
10.1109/jlt.2023.3259070
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发表时间：
2023-08
影响因子：
4.7
通讯作者：
Linpeng Yu;Jinhui Liang;Z.K. Tang;Jinzhang Wang;Jiachen Wang;Xing Luo;P. Yan;Fan-long Dong;Xing Liu;Q. Lue;C. Guo;S. Ruan
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文献类型：
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作者：
Linpeng Yu;Jinhui Liang;Z.K. Tang;Jinzhang Wang;Jiachen Wang;Xing Luo;P. Yan;Fan-long Dong;Xing Liu;Q. Lue;C. Guo;S. Ruan
本文从理论上研究了掺铒氟化物光纤中偏振相关的超短脉冲放大。数值模型基于耦合的广义非线性薛定谔方程和速率方程。研究发现，通过将种子偏振态由线偏振态转变为圆偏振态，可以减弱拉曼效应。与线偏振种子脉冲相比，圆偏振种子脉冲的放大可以产生具有相同中心波长的更大脉冲能量的拉曼孤子，但需要更大的泵浦功率。此外，放大动力学时，没有脉冲分裂发生也进行了研究。我们证明了圆偏振种子脉冲的放大允许主脉冲积累更多的能量，同时保持单脉冲轮廓。预测掺铒氟化物光纤放大器可直接产生峰值功率为兆瓦级、脉冲能量为数百纳焦耳的2.8 μm亚二周期激光脉冲。本文的研究结果可为基于拉曼孤子的可调谐光纤激光器系统和高功率少周期光纤激光器系统的设计提供指导。
We have theoretically investigated the polarization-dependent ultrashort pulse amplification in erbium-doped fluoride fibers. The numerical model is based on the coupled generalized nonlinear Schrödinger equations and the rate equations. It is found that the Raman effect can be weakened by converting the seed polarization from linear to circular. Compared with the linearly polarized seed pulses, amplification of the circularly polarized seed pulses can generate Raman solitons with a larger pulse energy of the same central wavelength, although more pump power is needed. Furthermore, the amplification dynamics when no pulse splitting occurs have also been investigated. We demonstrate that amplification of the circularly polarized seed pulses allows the main pulse to accumulate more energy while maintaining a single-pulse profile. It is predicted that sub-two-cycle laser pulses at 2.8 μm with megawatt peak power and hundreds of nanojoules pulse energy can be directly generated from the erbium-doped fluoride fiber amplifiers. The investigations conducted in this article can provide guidelines for the design of Raman-soliton-based tunable fiber laser systems and high-power few-cycle fiber laser systems.