Browsing by Author "Zhang, Yusheng"

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Dichromatic Soliton-Molecule Compounds in Mode-Locked Fiber Lasers
(2024-06) Cui, Yudong; Yao, Xiankun; Hao, Xiang; Yang, Qing; Chen, Daru; Zhang, Yusheng; Liu, Xu; Sun, Zhipei; Malomed, Boris A.
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Soliton “molecules”, i.e., bound states of two or several solitons, represent a fundamental concept, which manifests itself in various nonlinear systems. They are dynamically similar to chemical molecules, attracting great interest to fundamental studies and offering potential applications (such as multilevel encoding of optical data). Here, the study demonstrates a novel dichromatic soliton-molecule compounds (DSMC) built as a hybrid bound state of multiple bound soliton pulses carried by two wavelengths in a fiber laser. The DSMCs are maintained by two different binding mechanisms, viz., the self-phase modulation (SPM) interaction between temporal solitons at the same wavelength, mediated by their tails, and the cross-phase modulation (XPM) interaction between solitons at different wavelengths. They also exhibit unique temporal and spectral vibration profiles. Both static DSMCs and ones with robust internal vibrations are generated experimentally in the fiber laser, and numerically as solutions of the corresponding dissipative nonlinear model. The findings reported here expand the concept of soliton molecules and further promote their similarity to chemical molecules.
Temporal soliton dynamics of synchronised ultrafast fibre lasers
(2023-09-25) Zheng, Jiancheng; Li, Diao; Cui, Xiaoqi; Liu, Peng; Zhang, Qiang; Zhu, Zhiwei; Yang, Song; Zhang, Yusheng; Sun, Jiaxing; Chen, Xianfeng; Haima, Yang; Kauppinen, Esko; Sun, Zhipei
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Synchronised ultrafast soliton lasers have attracted great research interest in recent decades. However, there is a lack of comprehensive understanding regarding the buildup mechanism of synchronised pulses. Here, we report a dynamic analysis of independent and synchronised solitons buildup mechanisms in synchronised ultrafast soliton lasers. The laser comprises an erbium-doped fibre cavity and a thulium-doped fibre cavity bridged with a common arm. Pulses operating at two different wavelengths formed in the cavities are synchronised by cross-phase modulation-induced soliton correlation in the common fibre arm. We find that the whole buildup process of the thulium-doped fibre laser successively undergoes five different stages: continuous wave, relaxation oscillation, quasi-mode-locking, continuous wave mode-locking and synchronised mode-locking. It is found that the starting time of the synchronised solitons is mainly determined by the meeting time of dual-color solitons. Our results will further deepen the understanding of dual-color synchronised lasers and enrich the study of complex nonlinear system dynamics.