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arXiv 1412.0965physics.opticsnlin.CD
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抽运波长漂移对线偏振光纤放大器模式不稳定性的抑制

Mitigating of Modal Instabilities in Linearly-Polarized Fiber Amplifiers by Shifting Pump Wavelength

Rumao Tao, Pengfei Ma, Xiaolin Wang, Pu Zhou, Zejin Liu

摘要:

研究了高功率线偏振掺Yb光纤放大器中泵浦波长对模式不稳定性的影响。我们建立了一个新的半解析模型来确定MI的频率耦合特性和功率阈值,这表明通过在适当的波长泵浦有希望的MI抑制。在915nm泵浦下,阈值比976nm泵浦下的阈值提高了2.36倍。基于一个高功率线偏振光纤放大器平台,实验研究了抽运波长对放大器性能的影响。在915nm处,阈值提高了2倍,与理论计算一致,验证了我们的理论模型。此外,我们发现,MI抑制失谐的泵浦波长被削弱与大芯包层比的光纤。

英文摘要:

We investigated the effct of pump wavelength on the modal instabilities (MI) in high power linearly-polarized Yb-doped fiber amplifiers. We built a novel semi-analytical model to determine the frequency coupling characteristics and power threshold of MI, which indicates promising MI suppression through pumping at an appropriate wavelength. By pumping at 915nm, the threshold can be enhanced by a factor of 2.36 as compared to that pumped at 976nm. Based on a high power linearly-polarized fiber amplifier platform, we studied the influence of pump wavelength experimentally. The threshold has been increased by a factor of 2 at 915nm, which agrees with the theoretical calculation and verified our theoretical model. Furthermore, we show that MI suppression by detuning the pump wavelength is weakened for fiber with large core-to-cladding ratio.

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