Luo Yiyang, Xiang Yang, Liu Tao, Liu Bowen, Xia Ran, Yan Zhijun, Tang Xiahui, Liu Deming, Sun Qizhen, Shum Perry Ping
Opt Lett. 2019 Sep 1;44(17):4263-4266. doi: 10.1364/OL.44.004263.
Recent progress in time-stretch spectroscopy accelerates the exploration of ultrafast dynamics in mode-locked lasers through mapping the spectral information into time domain. Here, we report on real-time access to the coexistence of soliton singlets and molecules in an all-fiber laser mode-locked by a 45° tilted fiber grating. By virtue of the dispersive Fourier transform process, spectral information of the pulse trains under multi-pulse states can be resolved. It is identified that soliton singlets and soliton molecules coexist in one cavity roundtrip with different assembling forms. In addition, consecutive recordings of the shot-to-shot spectra further enable insight into the transient dynamics of soliton molecules. Particularly, varieties of internal motions, including the diverging/oscillating phase evolution and the temporal separation vibration, are validated loosely bound intra-soliton molecules. All of these findings unveil the scenarios of multi-soliton phenomena in fiber lasers, as well as highlight the significance of pulse interaction towards both scientific research and practical applications.
时间拉伸光谱学的最新进展通过将光谱信息映射到时间域，加速了对锁模激光器中超快动力学的探索。在此，我们报告了在由45°倾斜光纤光栅锁模的全光纤激光器中实时获取孤子单重态和孤子分子共存的情况。借助色散傅里叶变换过程，可以解析多脉冲状态下脉冲序列的光谱信息。已确定孤子单重态和孤子分子以不同的组装形式在一个腔往返中共存。此外，逐次光谱的连续记录进一步有助于深入了解孤子分子的瞬态动力学。特别是，包括发散/振荡相位演化和时间分离振动在内的各种内部运动，被确认为松散束缚的孤子内分子。所有这些发现揭示了光纤激光器中多孤子现象的情况，同时也突出了脉冲相互作用在科学研究和实际应用中的重要性。
