Chen Tiandao, Pan Jinyu, Huang Zhiyuan, Yu Yue, Liu Donghan, Chang Xinshuo, Liu Zhengzheng, He Wenbin, Jiang Xin, Pang Meng, Leng Yuxin, Li Ruxin
State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS), Shanghai, 201800, China.
Russell Centre for Advanced Lightwave Science, Shanghai Institute of Optics and Fine Mechanics and Hangzhou Institute of Optics and Fine Mechanics, Hangzhou, 311421, China.
Nat Commun. 2024 Oct 7;15(1):8671. doi: 10.1038/s41467-024-52955-6.
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.
作为孤子动力学的一种重要现象，相干色散波发射在从光纤波导到集成光子学的多个非线性光学平台中都有体现。然而，受其共振特性的限制，高效产生具有超宽带宽的相干色散波已被证明难以实现。在此，我们揭示了一种新的孤子动力学机制，其中色散波发射过程与驱动脉冲的分裂动力学强烈耦合。在孤子自压缩过程中积累的高阶色散和自陡峭效应打破了系统对称性，从而在紫外区域高效产生相干色散波。同时，非对称孤子分裂导致出现一个高强度的时间延迟超短脉冲，与色散波脉冲重叠并共传播。强烈的交叉相位调制导致色散波光谱八度宽展宽，覆盖200 - 400纳米波长。从简单的毛细管光纤装置中产生的高相干、八度宽的紫外光谱，在时间分辨光谱、超快电子显微镜和频率计量应用中具有很大需求，并且二次脉冲在这一过程中的关键作用揭示了全光控制通用孤子动力学的一些新机遇。
