Graduate School of Engineering, Osaka University, Suita, Japan.
Phys Rev Lett. 2011 Aug 12;107(7):073602. doi: 10.1103/PhysRevLett.107.073602. Epub 2011 Aug 10.
We study the nonlinear interaction of laser light with vacuum for a large angular aperture at electromagnetic field strengths far below the Schwinger limit. The polarization and magnetization in vacuum irradiated by a focused laser beam clearly differ from those in matter. This is due to the dependence on the Lorentz invariant, which results in a ring-shaped radiation distribution in vacuum. The number of the radiated photons increases nonlinearly with increasing angular aperture.
我们研究了在远低于施温格极限的电磁场强度下，大角孔径的激光与真空的非线性相互作用。聚焦激光束辐照下的真空的极化和磁化与物质中的明显不同。这是由于对洛伦兹不变量的依赖，导致真空产生环形辐射分布。辐射光子的数量随角孔径的增加呈非线性增加。
