The single-shot spectral dynamics of dual-color-soliton collisions inside a mode-locked laser is experimentally and numerically investigated. By using the all-optically dispersive Fourier transform, we spectrally unveil the collision-induced soliton self-reshaping process, which features dynamic spectral fringes over the soliton main lobe, and the rebuilding of Kelly sidebands with wavelength drifting. Meanwhile, the numerical simulations validate the experimental observation and provide additional insights into the physical mechanism of the collision-induced spectral dynamics from the temporal domain perspective. It is verified that the dynamic interference between the soliton and the dispersive waves is responsible for the observed collision-induced spectral evolution. These dynamic phenomena not only demonstrate the role of dispersive waves in the sophisticated soliton interaction inside the laser cavity, but also facilitate a deeper understanding of the soliton's inherent stability.

中文翻译：

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锁模光纤激光器中双色孤子腔内碰撞的超快光谱动力学

通过实验和数值研究了锁模激光器内双色孤子碰撞的单次光谱动力学。通过使用全光色散傅立叶变换，我们在光谱上揭示了碰撞引起的孤子自整形过程，其特征是孤子主瓣上的动态光谱条纹，以及波长漂移的凯利边带重建。同时，数值模拟验证了实验观察，并从时域的角度对碰撞引起的光谱动力学的物理机制提供了额外的见解。验证了孤子和色散波之间的动态干扰是观察到的碰撞诱导光谱演化的原因。