Olivier Michel, Boulanger Vincent, Guilbert-Savary Félix, Sidorenko Pavel, Wise Frank W, Piché Michel
Opt Lett. 2019 Feb 15;44(4):851-854. doi: 10.1364/OL.44.000851.
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.
我们研究了在飞秒掺铒光纤马梅舍夫振荡器中实现纳焦级脉冲能量的可能性。在实验中，激光器产生能量高达31.3 nJ的稳定脉冲序列，这与之前超快掺铒光纤激光器所达到的最高能量相当。经过光栅压缩器后的脉冲持续时间约为100 fs。然而，随着脉冲能量的增加，脉冲质量显著下降，相当一部分能量进入了皮秒级的基座。数值模拟与实验观测结果一致，并使我们能够确定掺铒光纤的增益谱和非线性是此类振荡器在高脉冲能量下运行的挑战。
