德国埃森大学研究人员用飞秒激光脉冲和时间分辨显微术观测了各种材料中的牛顿环。用牛顿环可以更好了解激光的烧蚀和确证与材料无关的烧蚀机制（见图）。过去几年中，以超快激光为基础的烧蚀已受到很大关注。这个过程对激光外科术和微加工等一系列应用都有重要意义。在研... Researchers at the University of Essen, Germany, observed Newton’s rings in various materials using femtosecond laser pulses and time-resolved microscopy. Newton rings give a better understanding of laser ablation and confirm material-independent ablation mechanisms (see figure). In the past few years, ultra-fast laser-based ablation has drawn much attention. This process is of great importance for a wide range of applications such as laser surgery and micromachining. In research...