Relativistic flying laser focus by a laser-produced parabolic plasma mirror
Relativistic flying laser focus by a laser-produced parabolic plasma mirror
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激光产生的抛物面等离子体镜的相对论飞行激光聚焦
DOI：
10.1103/physreva.104.053533
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发表时间：
2021
影响因子：
2.9
通讯作者：
Tae Moon Jeong; Sergei V. Bulanov; Petr Valenta; Georg Korn; Timur Zh Esirkepov; James K. Koga; Alexander S. Pirozhkov; Masaki Kando; and Stepan S. Bulanov
中科院分区：
文献类型：
--
作者：
Victor Bastidas;T. Osada;M. P. Estarellas;B. Renoust;William J. Munro and Kae Nemoto;Tae Moon Jeong; Sergei V. Bulanov; Petr Valenta; Georg Korn; Timur Zh Esirkepov; James K. Koga; Alexander S. Pirozhkov; Masaki Kando; and Stepan S. Bulanov
电磁场增强到强场量子电动力学的典型值的问题是至关重要的。最有前途的增强方案之一是基于相对论飞行镜概念，该概念表明，由镜子反射的电磁辐射将被频率上移一个因子（是镜子的洛伦兹因子）。在激光-等离子体相互作用中，这样的反射镜以相对论速度穿过等离子体，并且通常具有抛物线形式，这有利于光增强。因此，相对论飞行抛物面反射镜以具有高频率的聚焦和飞行电磁波的形式反射反向传播的辐射。激光焦点的相对论飞行运动使焦点的电场和磁场分布变得复杂，而描述焦点场分布的数学表达式成为人们关注的焦点。我们提出了一个理想的飞行反射镜，在整个表面和波长范围内具有完美的反射率所形成的场分布的解析表达式描述。在相对论极限下，中心波长为λ，有效光束半径为λ的入射激光脉冲的峰值场强增加了λ。在增强电磁场的基础上，研究了不变场条件下正负电子对的产生。在相对论飞行激光聚焦下的电子对产生率由洛伦兹因子和光束半径波长比（）修正。我们证明，电子-正电子对可以通过真空中两个反向传播的相对论飞行激光焦点碰撞产生，每个焦点都是当180 TW激光脉冲被相对论飞行抛物面镜反射时形成的。
The question of electromagnetic field intensification towards the values typical for strong field quantum electrodynamics is of fundamental importance. One of the most promising intensification schemes is based on the relativistic-flying mirror concept, which shows that the electromagnetic radiation reflected by the mirror will be frequency upshifted by a factor of(is the Lorentz factor of the mirror). In laser-plasma interactions, such a mirror travels with relativistic velocities through plasma and typically has a parabolic form, which is advantageous for light intensification. Thus, a relativistic-flying parabolic mirror reflects the counterpropagating radiation in the form of a focused and flying electromagnetic wave with a high frequency. The relativistic-flying motion of the laser focus makes the electric and magnetic field distributions of the focus complicated, and the mathematical expressions describing the field distributions of the focus become of fundamental interest. We present analytical expressions describing the field distribution formed by an ideal flying mirror which has a perfect reflectance over the entire surface and wavelength range. The peak field strength of an incident laser pulse with a center wavelength ofand an effective beam radius ofis enhanced by a factor proportional toin the relativistic limit. Electron-positron pair production is investigated in the context of invariant fields based on the enhanced electromagnetic field. The pair production rate under the relativistic-flying laser focus is modified by the Lorentz-factor and the beam radius-wavelength ratio (). We show that the electron-positron pairs can be created by colliding two counterpropagating relativistic-flying laser focuses in vacuum, each of which is formed when a 180 TW laser pulse is reflected by a relativistic-flying parabolic mirror with.