论文标题
激光辐射等离子体中同步辐射的自我吸收
Self-absorption of synchrotron radiation in a laser-irradiated plasma
论文作者
论文摘要
在强度超过$ 10^{23}〜\ mathrm {w} \ mathrm {cm}^{ - 2} $的激光器表面的电子，该激光被激光辐射，其强度超过$ 10^{23}〜\ mathrm {w} \ Mathrm {cm}^{ - 2} $。尽管在等离子体表面上高光子和电子密度和电磁场强度的组合使粒子粒子相互作用成为可能，但这些相互作用通常在模拟高强度状态的模拟中被忽略。在这里，我们证明了两个这样的过程的实现：光子吸收和刺激的发射。我们表明，对于不透明激光的等离子体，除非通过刺激的发射补偿，否则光子吸收会导致同步子光子光谱的多键区域的完全消耗。我们的结果激发了对强电磁场中QED现象的密度依赖性的进一步研究。
Electrons at the surface of a plasma that is irradiated by a laser with intensity in excess of $10^{23}~\mathrm{W}\mathrm{cm}^{-2}$ are accelerated so strongly that they emit bursts of synchrotron radiation. Although the combination of high photon and electron density and electromagnetic field strength at the plasma surface makes particle-particle interactions possible, these interactions are usually neglected in simulations of the high-intensity regime. Here we demonstrate an implementation of two such processes: photon absorption and stimulated emission. We show that, for plasmas that are opaque to the laser light, photon absorption would cause complete depletion of the multi-keV region of the synchrotron photon spectrum, unless compensated by stimulated emission. Our results motivate further study of the density dependence of QED phenomena in strong electromagnetic fields.
