在全正色散光纤激光器的基础上,数值研究了不同泵浦方式对抛物线脉冲产生的影响。建立了全正色散光纤激光器的模型,具体研究了不同泵浦方式下不同的增益可饱和能量以及增益带宽对激光器输出抛物线脉冲的拟合因子、脉宽、频谱宽度和脉冲能量的影响。结果表明,后向泵浦方式下激光器能输出更大能量的抛物线脉冲,而且能在更低的增益可饱和能量下产生抛物线脉冲。后向泵浦方式的全正色散光纤激光器可以在更大的增益可饱和能量范围内保持抛物线形脉冲的输出。全正色散腔中增益光纤的增益带宽对抛物线脉冲输出特性的影响较小。

On the basis of all-normal-dispersion fiber laser, the influences of different pumping schemes on the generation of parabolic pulses are numerically investigated. By establishing the mode of all-normal-dispersion fiber lasers, we have studied the effects of gain saturation energy and gain bandwidth on the fitting factor, pulse width, spectrum width, and pulse energy of the output parabolic pulses. The results show that in backward pumping mode, the laser can output parabolic pulses with higher energy, and can generate parabolic pulses with lower gain saturation energy. The backward pumped all-normal-dispersion fiber laser can maintain the output of the parabolic pulses in a larger gain and saturation energy range. The gain bandwidth of gain fiber has a small influence on the output characteristics of the parabolic pulses in different pumping schemes.