In article number 1900317, Wen‐Cheng Xu, Zhi‐Chao Luo, and co‐workers unveil a novel type of soliton pulsation in an ultrafast laser. The observed pulsating dynamics cannot be resolved by routine diagnostic methods because of the almost unchanged energy, which is termed as “invisible” soliton pulsation. Here, a real‐time spectroscopy technique is skillfully applied to identify the newly discovered pulsating dynamics. The cover shows an artistic representation of the pulsating dynamics in both the spectral and temporal domains.

中文翻译：

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隐形孤子脉动：在超快激光器中可视化“隐形”孤子脉动（Laser Photonics Rev. 14（4）/ 2020）

在徐文成，罗志超及其同事的第1900317号文章中，他们揭示了一种新型的超快激光中的孤子脉冲。观察到的脉动动力学无法通过常规诊断方法解决，因为能量几乎保持不变，这被称为“不可见”孤子脉动。在这里，实时光谱技术被巧妙地用于识别新发现的脉动​​动力学。封面显示了频谱和时间域中脉动动力学的艺术表现。