We investigated the possibility of reaching nanojoule-level pulse energies in a femtosecond erbium-doped fiber Mamyshev oscillator. In experiments, lasers generate stable pulse trains with energy up to 31.3 nJ, which is comparable to the highest achieved by prior ultrafast erbium fiber lasers. The pulse duration after a grating compressor is around 100 fs. However, as the pulse energy increases, the pulse quality degrades significantly, with a substantial fraction of the energy going into a picosecond pedestal. Numerical simulations agree with the experimental observations, and allow us to identify the gain spectrum and the nonlinearity of the erbium-doped fibers as challenges to the operation of such oscillators at high pulse energy.

中文翻译：

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飞秒光纤Mamyshev振荡器在1550 nm

我们研究了在飞秒掺-光纤Mamyshev振荡器中达到纳米焦级脉冲能量的可能性。在实验中，激光器产生的稳定脉冲序列的能量高达31.3 nJ，这与以前的超快光纤激光器所能达到的最高能量相当。光栅压缩器后的脉冲持续时间约为100 fs。但是，随着脉冲能量的增加，脉冲质量会显着降低，其中相当一部分能量会进入皮秒的基座。数值模拟与实验观察结果一致，并允许我们确定增益谱和掺fibers光纤的非线性特性，这是对此类振荡器在高脉冲能量下工作的挑战。