Zhou Yi, Ren Yu-Xuan, Shi Jiawei, Wong Kenneth K Y
Opt Express. 2022 Jun 6;30(12):21931-21942. doi: 10.1364/OE.461092.
Optical solitons, particle-like excitations ubiquitous in many fields, can bind to form soliton molecules with striking molecule-like interactions. However, the exotic soliton interactions in soliton molecules are still largely unexplored in dual-wavelength mode-locked fiber lasers. Here, we reveal the dynamics of dissipative soliton molecules with periodic solitons collision in a dual-wavelength ultrafast fiber laser. The soliton molecules with a central wavelength of 1532.8 nm and 1561 nm exhibit conspicuously different evolution characteristics attributed to the difference in gain spectral intensity and trapped potential. The long-wavelength soliton molecule swiftly recovers to the initial state after collision, while the short-wavelength soliton molecule has a remarkable variation in temporal separation and operation state. Moreover, the multiple intensive repulsion and attraction in soliton molecule with energy transfer between leading and trailing solitons, and the formation of triplet soliton molecule in short-wavelength with multiple switching have also been observed. The different oscillating solutions coexisting in dual-wavelength soliton molecules involving oscillating and sliding phase evolution confirm the multistability of the dissipative system. These findings shed new insights into the dynamics of soliton molecules and solitons collision in nonlinear systems.
光学孤子是许多领域中普遍存在的类粒子激发，它们可以结合形成具有显著类分子相互作用的孤子分子。然而，在双波长锁模光纤激光器中，孤子分子中奇异的孤子相互作用仍在很大程度上未被探索。在此，我们揭示了双波长超快光纤激光器中具有周期性孤子碰撞的耗散孤子分子的动力学。中心波长为1532.8纳米和1561纳米的孤子分子由于增益光谱强度和俘获势的差异而表现出明显不同的演化特性。长波长孤子分子在碰撞后迅速恢复到初始状态，而短波长孤子分子在时间间隔和运行状态上有显著变化。此外，还观察到孤子分子中存在多次强烈的排斥和吸引，前导孤子和尾随孤子之间有能量转移，以及短波长中形成具有多次切换的三重态孤子分子。双波长孤子分子中同时存在涉及振荡和滑动相位演化的不同振荡解，证实了耗散系统的多稳定性。这些发现为非线性系统中孤子分子的动力学和孤子碰撞提供了新的见解。
