Octave-wide broadening of ultraviolet dispersive wave driven by soliton-splitting dynamics

Tiandao Chen, Jinyu Pan, Zhiyuan Huang (), Yue Yu, Donghan Liu, Xinshuo Chang, Zhengzheng Liu, Wenbin He, Xin Jiang, Meng Pang (), Yuxin Leng () and Ruxin Li
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Tiandao Chen: Chinese Academy of Sciences (CAS)
Jinyu Pan: Chinese Academy of Sciences (CAS)
Zhiyuan Huang: Chinese Academy of Sciences (CAS)
Yue Yu: Chinese Academy of Sciences (CAS)
Donghan Liu: Chinese Academy of Sciences (CAS)
Xinshuo Chang: Chinese Academy of Sciences (CAS)
Zhengzheng Liu: Chinese Academy of Sciences (CAS)
Wenbin He: Shanghai Institute of Optics and Fine Mechanics and Hangzhou Institute of Optics and Fine Mechanics
Xin Jiang: Shanghai Institute of Optics and Fine Mechanics and Hangzhou Institute of Optics and Fine Mechanics
Meng Pang: Chinese Academy of Sciences (CAS)
Yuxin Leng: Chinese Academy of Sciences (CAS)
Ruxin Li: Chinese Academy of Sciences (CAS)

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Coherent dispersive wave emission, as an important phenomenon of soliton dynamics, manifests itself in multiple platforms of nonlinear optics from fibre waveguides to integrated photonics. Limited by its resonance nature, efficient generation of coherent dispersive wave with ultra-broad bandwidth has, however, proved difficult to realize. Here, we unveil a new regime of soliton dynamics in which the dispersive wave emission process strongly couples with the splitting dynamics of the driving pulse. High-order dispersion and self-steepening effects, accumulated over soliton self-compression, break the system symmetry, giving rise to high-efficiency generation of coherent dispersive wave in the ultraviolet region. Simultaneously, asymmetric soliton splitting results in the appearance of a temporally-delayed ultrashort pulse with high intensity, overlapping and copropagating with the dispersive wave pulse. Intense cross-phase modulations lead to octave-wide broadening of the dispersive wave spectrum, covering 200–400 nm wavelengths. The highly-coherent, octave-wide ultraviolet spectrum, generated from the simple capillary fibre set-up, is in great demand for time-resolved spectroscopy, ultrafast electron microscopy and frequency metrology applications, and the critical role of the secondary pulse in this process reveals some new opportunities for all-optical control of versatile soliton dynamics.

Date: 2024
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DOI: 10.1038/s41467-024-52955-6

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