Wang Zhenhong, Ma Chunyang, Song Yufeng, Liu Jun, Zhu Haiyong, Duan Yanmin, Zhang Han
Opt Express. 2020 Dec 21;28(26):39463-39474. doi: 10.1364/OE.413597.
We demonstrate the coexisting dynamics of loosely bound solitons and noise-like pulses (NLPs) in a passively mode-locked fiber laser with net-normal dispersion. The total pulse number of the single soliton bunch under the NLP operation regime almost increases linearly with increasing pump power, whereas the average pulse spacing decreases accordingly. Furthermore, pulse-to-pulse separation between adjacent soliton pulses in one soliton bunch keeps in the range of hundreds of picoseconds, which decreases from left to right with the change of time. Besides, the real-time observation has been performed by utilizing the time-stretch method, showing that each one of the loosely bound solitons on the NLP operation is actually composed of chaotic wave packets with random intensities. These findings obtained will facilitate the in-depth understanding of nonlinear pulse behaviors in ultrafast optics.
我们展示了在具有净正色散的被动锁模光纤激光器中，松散束缚孤子和类噪声脉冲（NLPs）的共存动力学。在NLP运行模式下，单个孤子束的总脉冲数几乎随泵浦功率的增加而线性增加，而平均脉冲间距相应减小。此外，一个孤子束中相邻孤子脉冲之间的脉冲到脉冲间隔保持在数百皮秒的范围内，并且随着时间的变化从左到右减小。此外，利用时间拉伸方法进行了实时观测，结果表明，在NLP运行模式下，每个松散束缚孤子实际上由强度随机的混沌波包组成。这些研究结果将有助于深入理解超快光学中的非线性脉冲行为。
