All-step-index-fiber spatiotemporally mode-locked laser

Author:

Gao Chenxin1,Cao Bo1,Ding Yihang1,Xiao Xiaosheng2ORCID,Yang Dali3,Fei Hongyang3,Yang Changxi1ORCID,Bao Chengying1ORCID

Affiliation:

1. Tsinghua University

2. Beijing University of Posts and Telecommunications

3. Hainan Normal University

Abstract

Spatiotemporal mode-locking (STML) in multi-mode fiber (MMF) lasers has extended the concept of temporal dissipative solitons into spatiotemporal dissipative solitons. To date, all reported STML in MMF lasers has used graded-index (GRIN) MMFs either solely or hybridly with other fibers. Compared to GRIN MMFs, step-index (STIN) MMFs have much larger intermode dispersion on both group and phase velocities. Building all-STIN MMF lasers can provide a new platform to explore the spatiotemporal dissipative soliton dynamics. Here, we report experimental and numerical observation of STML in an all-STIN MMF laser. Distinct from GRIN MMF lasers, the large intermode dispersion in the all-STIN MMF laser cannot be balanced by Kerr nonlinearity, and significant walk-off between mode-resolved pulses was observed experimentally. Simulations suggest that this walk-off is counteracted by spatial coupling in the laser, and a mother–child coupling mechanism is proposed to understand it. This mother–child coupling can enable STML with a single repetition rate with infinitely large intermode dispersion. Our work enriches MMF laser architectures for STML in a parameter regime that has not been considered, to our knowledge.

Funder

National Natural Science Foundation of China

Initiative Research of Tsinghua University

Beijing University of Posts and Telecommunications

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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