"Unveiling the Puzzling Relativistic Emission from Laser-Plasma Mirror Interactions"

Researchers have discovered a surprising transition during interactions between intense laser pulses and plasma mirrors, resulting in an anomalous emission of coherent extreme ultraviolet (XUV) radiation. This emission propagates parallel to the surface of the plasma mirror and is linked to laser-driven oscillations of relativistic electron nanobunches. The findings could lead to more studies exploring this anomalous emission and its potential for narrow-band coherent XUV generation.