Abstract

We report on the pulse instability in GHz repetition-rate thulium-doped fiber laser from the numerical perspective, hinging on a combined physical model that incorporates rate equations of rare-earth ion energy levels and nonlinear Schrödinger equation. In terms of this more explicit model, we predict two pulsating regimes, i.e., gain- and soliton-induced pulsations. Further, the study also reveals a novel type of pulse instability in a continuous wave mode locking (CWML) regime, in which the pulse-intensity fluctuates as well as a notable pedestal of radio-frequency spectrum arises. The proposed modeling can be universally applied, and the numerical results are able to offer reliable guidance to design high repetition rate mode-locked fiber lasers.

Theoretical and experimental analysis of instability of continuous wave mode locking: Towards high fundamental repetition rate in Tm³⁺-doped fiber lasers

H. Cheng, W. Lin, T. Qiao, S. Xu, and Z. Yang
Opt. Express 24(26) 29882-29895 (2016)

Scaling the repetition rate of thulium-doped ultrafast soliton fiber lasers to the GHz regime

Junjie Zeng, Ahmet E. Akosman, and Michelle Y. Sander
Opt. Express 26(19) 24687-24694 (2018)

Gain-guided soliton: Scaling repetition rate of passively modelocked Yb-doped fiber lasers to 12.5 GHz

Wenlong Wang, Wei Lin, Huihui Cheng, Yi Zhou, Tian Qiao, Yicai Liu, Pengfei Ma, Shifeng Zhou, and Zhongmin Yang
Opt. Express 27(8) 10438-10448 (2019)

Numerical investigation of GHz repetition rate fundamentally mode-locked all-fiber lasers

Yunxiu Ma, Xiushan Zhu, Luyun Yang, Minghong Tong, Robert A. Norwood, Huai Wei, Yingbo Chu, Haiqing Li, Nengli Dai, Jinggang Peng, Jinyan Li, and Nasser Peyghambarian
Opt. Express 27(10) 14487-14504 (2019)

Burst-mode thulium all-fiber laser delivering femtosecond pulses at a 1  GHz intra-burst repetition rate

Parviz Elahi, Hamit Kalaycioğlu, Önder Akçaalan, Çağri Şenel, and F. Ömer Ilday
Opt. Lett. 42(19) 3808-3811 (2017)