Soliton molecules in a fiber laser based on optic evanescent field interaction with WS2
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Passively mode-locked fiber laser serves as an ideal playground for exploring the dynamics of dissipative solitons. Recently, two-dimensional materials have attracted growing interests for their excellent optical properties in the research field of ultrafast optics. Here, we report an observation of soliton molecules in a passively mode-locked fiber laser based on optic evanescent field interaction with tungsten disulfide (WS2), which contributes to the study of multi-soliton complexes. Particularly, the WS2 saturable absorber (SA) is fabricated by optically depositing the few-layer WS2 nanosheets onto microfiber. In the experiment, stable mode-locking operations are realized, which manifest the effective performance of the WS2 SA. Harmonic mode-locking phenomena are also observed, and these separate solitons facilitate the generation of multi-soliton complexes. Furthermore, due to soliton–soliton interaction, wandering particle-like solitons can be bound together to produce soliton molecules and bunch of soliton molecules. These results enrich both the exploration of multi-soliton complexes and potential industrial applications.
This work is supported by the National Natural Science Foundation of China (Grant number: 61775072), the Wuhan Morning Light Plan of Youth Science and Technology (Grant number: 2017050304010280), the Fundamental Research Funds for the Central Universities (HUST, Grant number: 2017KFXKJC002), the Science Fund for Creative Research Groups of the Nature Science Foundation of Hubei (Grant number: 2018CFA004), the Major Projects of Technical Innovation of Hubei (Grant number: 2018AAA040), and the China Postdoctoral Science Foundation funded Project (Grant number: 2018M630853).
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