Passively mode-locked Ho-doped fiber laser with soliton rain and noise-like pulse regime

•Multiple pulse mode-locking operations with soliton rain and noise-like pulse regime are observed.•The influencing factors for soliton rain and the noise-like pulse mode-locking formation and transition are obtained.•Multiple pulse mode-locking operation in the >2000 nm region is realized from a...

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Bibliographic Details
Published in:Optics and laser technology 2022-09, Vol.153, p.108215, Article 108215
Main Authors: Hu, Ping, Mao, Jiajia, Zhou, Xue, Feng, Tianli, Nie, Hongkun, Wang, Ruihua, Zhang, Baitao, Li, Tao, He, Jingliang, Yang, Kejian
Format: Article
Language:English
Subjects:
Doped fibers
Evolution
Fiber lasers
Ho-doped fiber laser
Mode locking
Mode-locked fiber laser
Noise-like pulse
Nonlinear polarization rotation
Polarization
Pulse duration
Rain
Snakes
Solitary waves
Soliton rain
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Summary:•Multiple pulse mode-locking operations with soliton rain and noise-like pulse regime are observed.•The influencing factors for soliton rain and the noise-like pulse mode-locking formation and transition are obtained.•Multiple pulse mode-locking operation in the >2000 nm region is realized from a Ho-doped fiber oscillator.•The highest pulse energy and the output power in the NPR mode-locking Ho-doped fiber lasers are realized simultaneously. A passively Ho-doped fiber laser at 2 μm with soliton rain and noise-like pulse (NLP) operation regime has been realized by using nonlinear polarization rotation (NPR) technology. By adjusting the polarization state, the evolution phenomenon of soliton rain pulse and the NLP are obtained. The typical NLP mode-locking operation regime is achieved by finely adjusting pump power and polarization state, which delivers a corresponding pulse energy of 8.93 nJ with pulse width of 1.31 ps. The soliton rain operation regime with multiple solitons is achieved by finely adjusting pump power, which delivers a corresponding pulse energy of 22.98 nJ with pulse width of 1.21 ps. In addition, a NLP mode-locking operation regime is obtained again under a proper pump power and polarization state with a corresponding pulse energy of 34.14 nJ and pulse width of 1.18 ps. The experimental results well demonstrate the evolution of ultrashort pulse regime with the pump power and polarization state in passively mode-locked Ho-doped fiber lasers at 2 μm.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2022.108215