Internal motion within pulsating pure-quartic soliton molecules in a fiber laser

Song Yang, Zhiwei Zhu, Yaoyao Qi, Lei Jin, Li Li and Xuechun Lin

Chaos, Solitons & Fractals, 2023, vol. 172, issue C

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 dispersion-dependent pure-quartic solitons (PQS) molecules in a fiber laser. We discover the evolution from a single-pulse 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.

Keywords: Pure-quartic soliton; Soliton molecule; Pulsating dynamics; Gain competition effect; Fourth-order dispersion (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (9)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:chsofr:v:172:y:2023:i:c:s0960077923004459

DOI: 10.1016/j.chaos.2023.113544

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