While the performance of mode-locked fiber lasers has been improved significantly, the limited gain bandwidth restricts them to generate ultrashort pulses approaching a few cycles or even shorter. Here we present a novel method to achieve few cycle pulses (~5 cycles) with ultra-broad spectrum (~400 nm). To our best knowledge, this is the shortest pulse width and broadest spectrum directly generated from fiber lasers. It is noteworthy that a dramatic ultrashort pulse evolution can be stabilized in a laser oscillator by the unique nonlinear processes of a self-similar evolution as a nonlinear attractor in the gain fiber and a perfect saturable absorber action of the Mamyshev oscillator.

中文翻译：

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直接来自 Mamyshev 光纤振荡器的超宽带、少周期脉冲

虽然锁模光纤激光器的性能得到了显着提高，但有限的增益带宽限制了它们产生接近几个周期或更短的超短脉冲。在这里，我们提出了一种新方法，以实现具有超宽光谱（~400 nm）的少量循环脉冲（~5 个循环）。据我们所知，这是由光纤激光器直接产生的最短脉冲宽度和最宽光谱。值得注意的是，通过作为增益光纤中的非线性吸引子的自相似演化的独特非线性过程和 Mamyshev 振荡器的完美饱和吸收器作用，可以在激光振荡器中稳定超短脉冲的剧烈演化。