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基于扩展的标量非线性薛定谔方程,理论研究了不同抽运方式对正色散腔被动锁模掺镱光纤激光器输出特性的影响。结果表明,在初始总增益相同条件下,对于给定的增益饱和能量,反向抽运时耗散孤子的光谱宽度和脉冲宽度均比正向抽运时小,而对应的脉冲峰值功率比正向抽运时高,并且反向抽运时脉冲的啁啾线性拟合度相比正向抽运时低。当增益饱和能量相同时,正、反向抽运获得的耗散孤子的能量相等,但两种抽运方式下耗散孤子的光谱和时域波形的差异程度随增益饱和能量的增加而增大。
Based on the extended scalar nonlinear Schrödinger equation, the influence of different pumping modes on the output characteristics of passively mode-locked ytterbium-doped fiber lasers in a positive-dispersion cavity is theoretically studied. The results show that the spectral width and pulse width of the dissipative soliton at the time of reverse pumping are both smaller than those at the time of forward pumping for a given gain and saturation energy under the same initial total gain. The corresponding pulse peak power ratio When pumping to the high, and when the reverse pumping pulse chirp linear fit is lower than the positive pumping. When the gain and saturation energy are the same, the energy of the dissipative solitons obtained by positive and negative pumping are equal, but the difference between the spectrum and the time-domain waveform of the dissipative solitons under the two pumping modes increases with the increase of the gain and saturation energy .