Journal
OPTICS LETTERS
Volume 47, Issue 24, Pages 6369-6372Publisher
Optica Publishing Group
DOI: 10.1364/OL.475837
Keywords
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Funding
- Fundamental Research Funds for the Central Universities
- Natural Science Basic Research Program of Shaanxi
- National Natural Science Foundation of China
- [3102019JC008]
- [3102019PY002]
- [310202011QD003]
- [2019JQ-447]
- [2021JC-09]
- [12274344]
- [62105264]
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Researches experimentally and numerically revealed the formation and evolution of solitons in few-mode fiber lasers, the behavior of LP11 pulse transforming into LP01 pulse, and the stabilization of soliton fiber lasers.
Ultrafast few-mode fiber lasers have received increasing attention from basic research to practical applications due to their unique pulse performance and intriguing nonlinear dynamics. Here, we experimentally and numerically reveal the formation and evolution behaviors of a soliton in a mode -locked fiber laser composed of two-mode and single-mode fibers. The LP11 pulse walks away from the LP01 pulse in the two-mode fiber due to modal dispersion and then transforms into an auxiliary LP01 pulse after entering the single-mode fiber. After re-entering the two-mode fiber, the LP01 pulse excites the LP11 pulse via mode coupling; therefore, the LP11 pulse also consists of dominant and auxiliary pulses. Such a soliton fiber laser converges to an asymptotic steady state with unlocked spatial modes arising from the interplay between the strong modal dispersion and weak mode cou-pling.(c) 2022 Optica Publishing Group
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