Interaction of Ultraintense Laser Vortices with Plasma Mirrors
Interaction of Ultraintense Laser Vortices with Plasma Mirrors
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DOI：
10.1103/physrevlett.118.033902
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发表时间：
2017-01-18
影响因子：
8.6
通讯作者：
Quere, F.
中科院分区：
文献类型：
--
作者：
Denoeud, A.;Chopineau, L.;Quere, F.
携带轨道角动量(OAM)的激光光束在各种科学领域都有重要的应用，最近人们从理论上考虑了它们在超高强度激光与物质相互作用中的潜力。我们提出了一个实验，在这个实验中，这种光束与高达激光强度的等离子体反射镜相互作用，使得电子在激光场中的运动是相对论的。通过测量反射光束中产生的高次谐波的空间强度和位相分布，我们得到了高强度激光聚焦螺旋波前的证据，并研究了在极端激光强度下高非线性光学过程中OAM的守恒性。阐明了决定扭转谐波束场模含量的物理效应。
Laser beams carrying orbital angular momentum (OAM) have found major applications in a variety of scientific fields, and their potential for ultrahigh-intensity laser-matter interactions has since recently been considered theoretically. We present an experiment where such beams interact with plasma mirrors up to laser intensities such that the motion of electrons in the laser field is relativistic. By measuring the spatial intensity and phase profiles of the high-order harmonics generated in the reflected beam, we obtain evidence for the helical wavefronts of the high-intensity laser at focus, and study the conservation of OAM in highly nonlinear optical processes at extreme laser intensities. The physical effects determining the field mode content of the twisted harmonic beams are elucidated.