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Buildup dynamics of multiple solitons in spatiotemporal mode-locked fiber lasers
时空锁模光纤激光器中多孤子的形成动力学
時空間モード同期ファイバーレーザーにおける複数のソリトンの蓄積ダイナミクス
시공간 모드 고정 파이버 레이저에서 다중 솔리톤의 구축 역학
Dinámica de acumulación de múltiples solitones en láseres de fibra bloqueados en modo espacio-temporal
Dynamique d'accumulation de plusieurs solitons dans les lasers à fibre à verrouillage de mode spatio-temporel
Динамика нарастания множественных солитонов в волоконных лазерах с пространственно-временной синхронизацией мод
Kewei Liu 刘克为 ¹, Xiaosheng Xiao 肖晓晟 ², Yihang Ding ¹, Hongyan Peng 彭鸿雁 ³, Dongdong Lv ³, Changxi Yang 杨昌喜 ¹
¹ State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
中国 北京 清华大学精密仪器系 精密测试技术及仪器国家重点实验室
² State Key Laboratory of Information Photonics and Optical Communications, School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
中国 北京 北京邮电大学电子工程学院 信息光子学与光通信国家重点实验室
³ School of Physics and Electronic Engineering, Hainan Normal University, Haikou 571158, China
中国 海口 海南师范大学物理与电子工程学院
Photonics Research, 7 September 2021
Abstract

Spatiotemporal mode locking is a nonlinear process of multimode soliton self-organization. Here the real-time buildup dynamics of the multiple solitons in a spatiotemporal mode-locked multimode fiber laser are investigated, assisted by the time-stretch technique.

We find that the buildup processes are transverse mode dependent, especially during the stages of relaxation oscillation and Q-switching prior to multiple soliton formation. Furthermore, we observe that the transverse modal composition of these generated pulses among the multiple solitons can be different from each other, indicating the spatiotemporal structure of the multiple soliton.

A simplified theoretical model based on pulse energy evolution is put forward to interpret the role of 3D saturable absorber on spatiotemporal structures of spatiotemporal mode-locking multiple solitons. Our work has presented the spatiotemporal nonlinear dynamics in multimode fiber lasers, which are novel to those inside the single transverse mode fiber lasers.
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