All-fiber spatiotemporal mode-locking lasers with large modal dispersion

It is a challenging problem to balance the modal walk-off (modal dispersion) between multiple transverse modes and chromatic dispersion in long step-index multimode fibers (MMFs). By properly designing the oscillator, we have overcome the difficulty and successfully obtained an all-fiber spatiotempo...

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Bibliographic Details
Published in:Photonics research (Washington, DC) DC), 2022-02, Vol.10 (2), p.483
Main Authors: Zhang, Huaiwei, Zhang, Yunhong, Peng, Jiying, Su, Xinyang, Xiao, Xiaosheng, Xu, Dongjian, Chen, Junhao, Sun, Tianran, Zheng, Kai, Yao, Jianquan, Zheng, Yi
Format: Article
Language:English
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Summary:It is a challenging problem to balance the modal walk-off (modal dispersion) between multiple transverse modes and chromatic dispersion in long step-index multimode fibers (MMFs). By properly designing the oscillator, we have overcome the difficulty and successfully obtained an all-fiber spatiotemporal mode-locked laser based on step-index MMFs with large modal dispersion for the first time, to our knowledge. Various proofs of spatiotemporal mode-locking (STML) such as spatial, spectral, and temporal properties, are measured and characterized. This laser works at a fundamental frequency of 28.7 MHz, and achieves a pulse laser with single pulse energy of 8 nJ, pulse width of 20.1 ps, and signal-to-noise ratio of ∼ 70    dB . In addition, we observe a dynamic evolution of the transverse mode energy during the STML establishment process that has never been reported before.
ISSN:2327-9125
2327-9125
DOI:10.1364/PRJ.444750