High-order harmonics of laser pulses yield spectral components with shorter wavelength and duration and tighter focus than the original pulse. Precise spatiotemporal characterization of this radiation from a relativistic plasma mirror is relevant for ultrafast science.

中文翻译：

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相对论镜子的反射

激光脉冲的高次谐波产生比原始脉冲更短波长和持续时间以及更紧密聚焦的光谱分量。来自相对论等离子体镜的这种辐射的精确时空表征与超快科学有关。