Coherent motion of particles in a plasma can imprint itself on radiation. The recent advent of high-power lasers—allowing the nonlinear inverse Compton-scattering regime to be reached—has opened the possibility of looking at collective effects in laser–plasma interactions. Under certain conditions, the collective interaction of many electrons with a laser pulse can generate coherent radiation in the hard x-ray regime. This perspective paper explains the limitations under which such a regime might be attained.

中文翻译：

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强激光场中电子的集体相干发射和硬 X 射线激光器的前景

等离子体中粒子的相干运动可以在辐射上留下印记。最近出现的高功率激光器（允许达到非线性逆康普顿散射机制）为研究激光-等离子体相互作用中的集体效应提供了可能性。在某些条件下，许多电子与激光脉冲的集体相互作用可以在硬 X 射线区域产生相干辐射。这篇前瞻性文章解释了实现这种制度的局限性。