Author(s): Yang, S (Yang, Song); Zhu, ZW (Zhu, Zhiwei); Qi, YY (Qi, Yaoyao); Jin, L (Jin, Lei); Li, L (Li, Li); Lin, XC (Lin, Xuechun)

Source: CHAOS SOLITONS & FRACTALS Volume: 172  Article Number: 113544  DOI: 10.1016/j.chaos.2023.113544  Early Access Date: MAY 2023   Published: JUL 2023 

Abstract: Various striking nonlinear evolution dynamics have been observed in mode-locked fiber lasers owing to the high peak power of the solitons. Herein, we numerically demonstrate the dynamical generation of dispersiondependent pure-quartic solitons (PQS) molecules in a fiber laser. We discover the evolution from a singlepulse initial condition to different types of pulsating PQS molecules with enhanced net fourth-order dispersion, indicating that the internal motion and energy exchange can be both quasi-periodical and periodical. Furthermore, we reveal that the generation of these two types of pulsating PQS molecules is associated with a gain competition effect between the two sub pulses during mode-locking. Finally, we propose a new method that can achieve the transition between a loose PQS molecule and a tight PQS molecule. Enlightened by the numerical results, we speculate that more internal motion within the PQS molecule will be discovered, which will promote a deep insight into the physical mechanism behind.

Accession Number: WOS:001017231500001

Author Identifiers:

Author Web of Science ResearcherID ORCID Number

Yang, Song          0000-0003-4559-3308

ISSN: 0960-0779

eISSN: 1873-2887